744 FZUS51 KBUF 180803 NSHBUF Nearshore Marine Forecast National Weather Service Buffalo NY 403 AM EDT Mon May 18 2026 For waters within five nautical miles of shore Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. LEZ020-LOZ030-181500- Upper Niagara River and Buffalo Harbor-Lower Niagara River- 403 AM EDT Mon May 18 2026 .TODAY...Southwest winds 5 to 15 knots. Mostly sunny. .TONIGHT...Southwest winds 5 to 10 knots. A chance of showers overnight. .TUESDAY...Southwest winds 10 to 15 knots increasing to 15 to 20 knots. Partly sunny in the morning, then becoming mostly sunny. .TUESDAY NIGHT...Southwest winds 10 to 15 knots becoming west. Showers with a chance of thunderstorms in the evening, then showers overnight. .WEDNESDAY...West winds 10 knots or less becoming north. Showers likely during the day. .THURSDAY...Northeast winds 10 knots or less becoming east. Partly cloudy. .FRIDAY...East winds 5 to 10 knots. A chance of showers Friday night. Winds and waves higher in and near thunderstorms. The water temperature off Buffalo is 52 degrees. $$ LEZ040-041-181500- Buffalo to Ripley along Lake Erie- 403 AM EDT Mon May 18 2026 .TODAY...South winds 5 to 10 knots becoming southwest. Sunny. Waves 1 foot or less. .TONIGHT...Southwest winds 5 to 10 knots. Mainly clear in the evening, then becoming mostly cloudy. Waves 1 foot or less. .TUESDAY...Southwest winds 5 to 15 knots. Partly to mostly sunny. Waves 2 feet or less. .TUESDAY NIGHT...Southwest winds 10 to 15 knots becoming west. Showers with a chance of thunderstorms in the evening, then showers overnight. Waves 1 to 3 feet. .WEDNESDAY...West winds 5 to 10 knots becoming north. Showers during the day. Waves 1 to 3 feet subsiding to 1 foot or less. .THURSDAY...Northeast winds 5 to 10 knots becoming east. Partly cloudy. Waves 1 foot or less. .FRIDAY...East winds 5 to 10 knots becoming southeast. A chance of showers during the day, then showers likely Friday night. Waves 1 foot or less. Winds and waves higher in and near thunderstorms. $$ LOZ042-181500- Niagara River to Hamlin Beach along Lake Ontario- 403 AM EDT Mon May 18 2026 .TODAY...South winds 5 to 15 knots becoming southwest 15 to 20 knots. Becoming mostly sunny. Waves 1 to 3 feet. .TONIGHT...Southwest winds 15 to 20 knots diminishing to 10 to 15 knots. A chance of showers overnight. Waves 1 to 3 feet. .TUESDAY...Southwest winds 15 to 25 knots. Becoming mostly sunny. Waves 1 to 3 feet building to 2 to 4 feet. .TUESDAY NIGHT...Southwest winds 15 to 25 knots becoming west. Showers with a chance of thunderstorms in the evening, then showers overnight. Waves 3 to 5 feet subsiding to 2 to 4 feet. Waves occasionally around 6 feet. .WEDNESDAY...West winds 15 to 20 knots becoming northwest 10 to 15 knots. A chance of showers during the day. Waves 2 to 4 feet subsiding to 1 to 3 feet. .THURSDAY...Northeast winds 10 knots or less becoming east. Partly cloudy. Waves 2 feet or less. .FRIDAY...East winds 10 to 15 knots diminishing to 5 to 10 knots. A chance of showers Friday night. Waves 1 to 3 feet. Winds and waves higher in and near thunderstorms. $$ LOZ043-044-181500- Hamlin Beach to Mexico Bay along Lake Ontario including Irondequoit Bay- 403 AM EDT Mon May 18 2026 .TODAY...South winds 5 to 10 knots becoming southwest. Becoming mostly sunny. Waves 1 foot or less. .TONIGHT...South winds 5 to 10 knots becoming southwest. Partly to mostly cloudy. Waves 1 foot or less. .TUESDAY...Southwest winds 5 to 15 knots increasing to 15 to 20 knots. A chance of showers and thunderstorms in the afternoon. Waves 1 to 3 feet. .TUESDAY NIGHT...Southwest winds 15 to 20 knots becoming west. Showers with a chance of thunderstorms. Waves 1 to 3 feet building to 2 to 4 feet. .WEDNESDAY...West winds 15 to 20 knots becoming northwest. Showers likely during the day. Waves 3 to 5 feet building to 4 to 7 feet, then subsiding to 3 to 5 feet. Waves occasionally around 9 feet. .THURSDAY...North winds 5 to 15 knots becoming east less than 10 knots. Partly cloudy. Waves 1 to 3 feet subsiding to 1 foot or less. .FRIDAY...East winds 5 to 15 knots becoming southeast. A chance of showers Friday night. Waves 2 feet or less. Winds and waves higher in and near thunderstorms. The water temperature off Rochester is 48 degrees. $$ LOZ045-181500- Mexico Bay to the Saint Lawrence River along Lake Ontario- 403 AM EDT Mon May 18 2026 .TODAY...Southeast winds 5 to 15 knots becoming southwest. Becoming mostly sunny. Waves 2 feet or less. .TONIGHT...South winds 5 to 10 knots. A chance of showers. Waves 2 feet or less. .TUESDAY...South winds 10 to 15 knots becoming southwest. A chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. Waves 2 feet or less. .TUESDAY NIGHT...South winds 10 to 15 knots becoming southwest 15 to 20 knots. Showers with a chance of thunderstorms. Waves 1 to 3 feet building to 2 to 4 feet. .WEDNESDAY...West winds 15 to 20 knots becoming north 10 to 15 knots. Showers during the day. Waves 2 to 4 feet building to 3 to 6 feet. Waves occasionally around 7 feet. .THURSDAY...North winds 10 to 15 knots becoming light and variable. Mainly clear, then becoming partly cloudy. Waves 1 to 3 feet subsiding to 1 foot or less. .FRIDAY...East winds 10 knots or less becoming southeast. A chance of showers Friday night. Waves 1 foot or less. Winds and waves higher in and near thunderstorms. $$  346 FZUS53 KMKX 180810 NSHMKX Nearshore Marine Forecast National Weather Service Milwaukee/Sullivan WI 310 AM CDT Mon May 18 2026 For waters within five nautical miles of shore on Lake Michigan LMZ643-182100- Sheboygan to Port Washington WI- 310 AM CDT Mon May 18 2026 .EARLY THIS MORNING...South wind 10 to 15 knots. Mostly cloudy with a 50 percent chance of showers and thunderstorms. Areas of dense fog. Waves 3 to 5 feet. .TODAY...South wind 15 to 20 knots. Chance of showers and thunderstorms until late afternoon, then slight chance of showers and thunderstorms late in the afternoon. Waves 3 to 4 feet building to 4 to 6 feet late in the morning, then subsiding to 3 to 4 feet in the afternoon. .TONIGHT...South wind 15 to 20 knots becoming 15 to 25 knots early in the morning. Patchy fog through around midnight. slight chance of showers and thunderstorms through around midnight, then showers likely and a chance of thunderstorms after midnight. Waves 3 to 4 feet building to 4 to 6 feet. A small craft advisory may be needed. .TUESDAY...South wind 15 to 25 knots veering west late in the afternoon. Rain showers likely and a chance of thunderstorms through the day. Waves 5 to 7 feet subsiding to 3 to 4 feet. .TUESDAY NIGHT...Northwest wind 15 to 20 knots easing to 10 to 15 knots after midnight, then veering north early in the morning. Partly cloudy. Waves 2 to 4 feet subsiding to 1 to 2 feet in the late evening and overnight. $$ LMZ644-182100- Port Washington to North Point Light WI- 310 AM CDT Mon May 18 2026 .EARLY THIS MORNING...South wind 10 to 15 knots. Mostly cloudy with a 50 percent chance of showers and thunderstorms. Patchy dense fog. Waves 3 to 4 feet. .TODAY...South wind 10 to 20 knots becoming 15 to 20 knots in the late morning and early afternoon, then becoming south 15 to 20 knots late in the afternoon. Chance of showers and thunderstorms until late afternoon, then slight chance of showers and thunderstorms late in the afternoon. Waves 3 to 4 feet. .TONIGHT...South wind 15 to 20 knots becoming 15 to 25 knots early in the morning. Slight chance of showers and thunderstorms through around midnight, then showers likely and a chance of thunderstorms after midnight. Waves 3 to 4 feet building to 3 to 5 feet early in the morning. A small craft advisory may be needed. .TUESDAY...South wind 15 to 25 knots veering west late in the afternoon. Rain showers likely and a chance of thunderstorms through the day. Waves 3 to 5 feet subsiding to 3 to 4 feet in the afternoon. .TUESDAY NIGHT...Northwest wind 15 to 20 knots easing to 10 to 15 knots after midnight, then veering north early in the morning. Partly cloudy. Waves 1 to 2 feet. $$ LMZ645-182100- North Point Light to Wind Point WI- 310 AM CDT Mon May 18 2026 .EARLY THIS MORNING...South wind 10 to 15 knots. Mostly cloudy with a 50 percent chance of showers and thunderstorms. Waves 2 to 4 feet. .TODAY...South wind 15 to 20 knots. Rain showers likely in the morning. Chance of thunderstorms through the day. Chance of showers in the afternoon. Waves 2 to 4 feet. .TONIGHT...South wind 15 to 20 knots becoming 15 to 25 knots early in the morning. Slight chance of showers and thunderstorms through around midnight, then showers likely and a chance of thunderstorms after midnight. Waves 3 to 4 feet. A small craft advisory may be needed. .TUESDAY...South wind 15 to 25 knots veering southwest late in the morning, then veering west early in the afternoon becoming 15 to 20 knots late in the afternoon. Showers likely and a chance of thunderstorms. Waves 3 to 4 feet. .TUESDAY NIGHT...Northwest wind 15 to 20 knots easing to 10 to 15 knots late in the evening, then becoming northwest 10 to 15 knots after midnight veering north early in the morning. Partly cloudy. Waves 1 to 2 feet building to 2 to 4 feet early in the morning. $$ LMZ646-182100- Wind Point WI to Winthrop Harbor IL- 310 AM CDT Mon May 18 2026 .EARLY THIS MORNING...South wind 10 to 15 knots rising to 15 to 20 knots early in the morning. Partly cloudy with a 50 percent chance of showers and thunderstorms. Waves 2 to 4 feet. .TODAY...South wind 15 to 20 knots easing to 10 to 15 knots in the afternoon. Rain showers likely in the morning. Chance of thunderstorms through the day. Chance of showers in the afternoon. Waves 2 to 4 feet. .TONIGHT...South wind 15 to 20 knots becoming 15 to 25 knots early in the morning. Slight chance of showers and thunderstorms through around midnight, then showers likely and a chance of thunderstorms after midnight. Waves 3 to 4 feet. A small craft advisory may be needed. .TUESDAY...South wind 15 to 25 knots veering southwest late in the morning, then becoming 15 to 20 knots early in the afternoon veering west late in the afternoon. Showers likely and a chance of thunderstorms. Waves 3 to 4 feet subsiding to 1 to 2 feet late in the afternoon. .TUESDAY NIGHT...Northwest wind 10 to 15 knots with gusts to around 20 knots veering north early in the morning. Partly cloudy. Waves 1 to 2 feet. $$ See Lake Michigan Open Waters Forecast for Wednesday through Friday.  635 FZUS53 KDLH 180833 NSHDLH Nearshore Marine Forecast National Weather Service Duluth MN 333 AM CDT Mon May 18 2026 For waters within five nautical miles of shore on Lake Superior. Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. LSZ140-181600- Grand Portage to Grand Marais MN- 333 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots in the late morning and early afternoon. Chance of rain showers and slight chance of thunderstorms early in the morning, then slight chance of rain showers late in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet late in the afternoon. .TONIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots. Chance of rain showers in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 4 to 6 feet in the late evening and overnight. Waves occasionally to 8 feet. A small craft advisory may be needed. .TUESDAY...North wind 20 to 25 knots becoming northwest 10 to 15 knots with gusts to around 20 knots in the afternoon. Chance of rain showers in the morning. Waves 4 to 6 feet subsiding to 1 to 2 feet. Waves occasionally to 8 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 10 to 15 knots. Gusts up to 20 knots in the evening. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 2 feet. $$ LSZ141-181600- Grand Marais to Taconite Harbor MN- 333 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 5 to 10 knots becoming west late in the morning, then becoming southeast early in the afternoon becoming northeast late in the afternoon. Slight chance of showers and thunderstorms early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots after midnight. Chance of rain showers and slight chance of thunderstorms in the evening, then rain showers after midnight. Waves 1 to 3 feet building to 2 to 4 feet after midnight. .TUESDAY...North wind 5 to 10 knots becoming northwest in the afternoon. Gusts up to 20 knots. Chance of rain showers in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Gusts up to 20 knots early in the evening. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 2 feet. $$ LSZ142-181600- Taconite Harbor to Silver Bay Harbor MN- 333 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...North wind 5 to 10 knots becoming northwest late in the morning, then becoming southeast early in the afternoon becoming northeast late in the afternoon. Slight chance of showers and thunderstorms early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots with gusts to around 20 knots. Chance of rain showers in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 2 to 4 feet after midnight. A small craft advisory may be needed. .TUESDAY...Northwest wind 5 to 10 knots. Gusts up to 20 knots late in the afternoon. Chance of rain showers in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet late in the afternoon. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Gusts up to 20 knots early in the evening. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 2 feet. $$ LSZ143-181600- Silver Bay Harbor to Two Harbors MN-333 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 5 to 10 knots. Slight chance of showers and thunderstorms early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots late in the evening increasing to 25 knots, then decreasing to 20 knots early in the morning. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 2 to 4 feet after midnight. A small craft advisory may be needed. .TUESDAY...North wind 5 to 10 knots becoming northwest in the late morning and afternoon. Chance of rain showers in the morning. Waves 2 to 4 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 2 feet. $$ LSZ144-181600- Two Harbors to Duluth MN- 333 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 5 to 10 knots. Slight chance of rain showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots late in the evening increasing to 25 knots, then decreasing to 20 knots early in the morning. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 2 to 4 feet after midnight. .TUESDAY...Northwest wind 10 to 15 knots. Gusts up to 20 knots in the late morning and afternoon. Chance of rain showers in the morning. Waves 2 to 4 feet. .TUESDAY NIGHT...Northwest wind 10 to 15 knots with gusts to around 20 knots easing to 5 knots after midnight. Mostly cloudy. Waves 1 to 2 feet. $$ LSZ145-181600- Duluth MN to Port Wing WI- 333 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 5 to 10 knots. Slight chance of rain showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 2 feet in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots late in the evening increasing to 25 knots, then decreasing to 20 knots early in the morning. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 3 to 5 feet in the late evening and overnight. A small craft advisory may be needed. .TUESDAY...North wind 10 to 15 knots becoming west in the late morning and afternoon. Gusts up to 20 knots. Chance of rain showers in the morning. Waves 2 to 4 feet. .TUESDAY NIGHT...Northwest wind 10 to 15 knots with gusts to around 20 knots becoming west 5 knots after midnight. Mostly cloudy. Waves 1 to 2 feet. $$ LSZ146-181600- Port Wing to Sand Island WI- 333 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 5 to 10 knots. Slight chance of rain showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 2 feet in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 25 knots. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 3 to 5 feet after midnight. A small craft advisory may be needed. .TUESDAY...North wind 5 to 10 knots with gusts to around 20 knots becoming west with gusts to around 20 knots in the late morning and afternoon. Chance of rain showers in the morning. Waves 3 to 5 feet subsiding to 1 to 3 feet late in the afternoon. A small craft advisory may be needed. .TUESDAY NIGHT...West wind 5 to 10 knots. Mostly cloudy. Waves 1 to 2 feet. $$LSZ147-181600- Sand Island to Bayfield WI- 333 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...North wind 5 to 10 knots becoming east late in the afternoon. Slight chance of rain showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 2 feet in the afternoon. .TONIGHT...Northeast wind 15 to 20 knots with gusts to around 25 knots. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 3 to 5 feet after midnight. A small craft advisory may be needed. .TUESDAY...North wind 10 to 15 knots with gusts to around 20 knots becoming west 5 to 10 knots with gusts to around 20 knots in the late morning and afternoon. Chance of rain showers in the morning. Waves 3 to 5 feet subsiding to 1 to 3 feet late in the afternoon. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Gusts up to 20 knots early in the evening. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 2 feet. $$ LSZ150-181600- Outer Apostle Islands Beyond 5 NM from Mainland- 333 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...North wind 5 to 10 knots becoming northeast late in the afternoon. Slight chance of showers and thunderstorms early in the morning. Waves 3 to 5 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 15 to 20 knots. Gusts up to 20 knots increasing to 25 knots in the late evening and overnight. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 4 to 7 feet in the late evening and overnight. Waves occasionally to 9 feet. A small craft advisory may be needed. .TUESDAY...North wind 10 to 15 knots with gusts to around 25 knots becoming west 5 to 10 knots with gusts to around 20 knots in the late morning and afternoon. Chance of rain showers in the morning. Waves 4 to 7 feet subsiding to 2 to 4 feet late in the afternoon. Waves occasionally to 9 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy. Waves 1 to 3 feet. $$ LSZ121-181600- Chequamegon Bay-Bayfield to Oak Point WI- 333 AM CDT Mon May 18 2026 .TODAY...North wind 5 knots becoming northeast in the afternoon. Slight chance of rain showers early in the morning. Waves 1 foot or less. .TONIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots in the late evening and early morning decreasing to 20 knots. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet. .TUESDAY...North wind 10 to 15 knots with gusts to around 20 knots becoming northwest with gusts to around 20 knots in the late morning and afternoon. Chance of rain showers in the morning. Waves 1 to 2 feet. .TUESDAY NIGHT...Northwest wind 10 to 15 knots with gusts to around 20 knots easing to 5 knots after midnight. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 foot or less. $$ LSZ148-181600- Oak Point to Saxon Harbor WI- 333 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...North wind 5 knots becoming northeast in the afternoon. Slight chance of rain showers early in the morning. Waves 1 to 3 feet. .TONIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots in the late evening and early morning decreasing to 20 knots. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 5 to 8 feet. Waves occasionally to 10 feet. A small craft advisory may be needed. .TUESDAY...North wind 10 to 15 knots with gusts to around 20 knots becoming northwest with gusts to around 20 knots in the late morning and afternoon. Chance of rain showers in the morning. Waves 4 to 6 feet. Waves occasionally to 8 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 10 to 15 knots with gusts to around 20 knots easing to 5 knots after midnight. Mostly cloudy. Waves 1 to 3 feet subsiding to 1 to 2 feet in the late evening and overnight. $$ Graphical marine forecasts are available online at: weather.gov/greatlakes WFO DLH  446 FZUS53 KGRB 180850 NSHGRB Nearshore Marine Forecast National Weather Service Green Bay WI 350 AM CDT Mon May 18 2026 For waters within five nautical miles of shore on Lake Michigan LMZ521-522-181600- Green Bay south of line from Cedar River to Rock Island Passage and north of a line from Oconto WI to Little Sturgeon Bay WI- Green Bay south of line from Oconto WI to Little Sturgeon Bay WI- 350 AM CDT Mon May 18 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CDT THIS MORNING... ...SMALL CRAFT ADVISORY IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY EVENING... .EARLY THIS MORNING...S wind 10 to 15 kts. Waves 2 ft or less. Patchy dense fog. a chance of showers and thunderstorms. .TODAY...S wind 10 to 15 kts. Waves 1 to 3 ft. Patchy dense fog in the morning. a chance of showers and a slight chance of thunderstorms. .TONIGHT...S wind 10 to 15 kts. Waves 1 to 3 ft. Patchy fog. a chance of showers and thunderstorms. .TUESDAY...SW wind 15 to 25 kts veering NW early in the afternoon. Waves 2 to 4 ft. A chance of showers in the morning. .TUESDAY NIGHT...NW wind 10 to 15 kts. Waves 1 to 3 ft. Mostly cloudy in the evening then becoming partly cloudy. $$ LMZ541-181600- Rock Island Passage to Sturgeon Bay WI- 350 AM CDT Mon May 18 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CDT THIS MORNING... ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TUESDAY NIGHT... .EARLY THIS MORNING...S wind 10 to 15 kts. Waves 3 to 5 ft. Patchy dense fog. a chance of showers and thunderstorms. .TODAY...S wind 15 to 25 kts decreasing to 10 to 15 kts early in the afternoon. Waves 4 to 7 ft. Patchy fog in the morning. a chance of showers and a slight chance of thunderstorms. .TONIGHT...S wind 10 to 15 kts increasing to 15 to 25 kts after midnight. Waves 5 to 8 ft. Patchy fog. a chance of showers in the evening. A chance of thunderstorms. Rain showers likely after midnight. .TUESDAY...SW wind 15 to 25 kts veering NW early in the afternoon. Waves 5 to 8 ft. A chance of showers in the morning. .TUESDAY NIGHT...NW wind 10 to 15 kts. Waves 3 to 5 ft subsiding to 1 to 3 ft after midnight. Mostly cloudy. $$ LMZ543-181600- Two Rivers to Sheboygan WI- 350 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TUESDAY NIGHT... .EARLY THIS MORNING...S wind 10 to 20 kts. Waves 3 to 5 ft. Patchy dense fog. a chance of showers and thunderstorms. .TODAY...S wind 15 to 25 kts. Waves 4 to 7 ft. Patchy dense fog in the morning. a chance of showers and thunderstorms. .TONIGHT...S wind 10 to 15 kts increasing to 15 to 25 kts in the late evening and overnight. Waves 4 to 7 ft. Patchy fog. a chance of showers and thunderstorms. .TUESDAY...SW wind 15 to 25 kts veering W in the late morning and afternoon. Waves 5 to 8 ft subsiding to 4 to 7 ft in the afternoon. A chance of showers in the morning. .TUESDAY NIGHT...NW wind 10 to 15 kts. Waves 2 to 4 ft. Partly cloudy. $$ LMZ542-181600- Sturgeon Bay to Two Rivers WI- 350 AM CDT Mon May 18 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CDT THIS MORNING... ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TUESDAY NIGHT... .EARLY THIS MORNING...S wind 10 to 20 kts. Waves 3 to 5 ft. Patchy dense fog. a slight chance of showers and thunderstorms. .TODAY...S wind 15 to 25 kts decreasing to 10 to 15 kts early in the afternoon. Waves 4 to 7 ft. Patchy dense fog. a chance of showers and a slight chance of thunderstorms. .TONIGHT...S wind 15 to 25 kts. Waves 4 to 7 ft. Patchy fog. a chance of showers and thunderstorms. .TUESDAY...S wind 15 to 25 kts veering W in the late morning and afternoon. Waves 5 to 8 ft subsiding to 4 to 7 ft in the afternoon. A chance of showers in the morning. .TUESDAY NIGHT...NW wind 10 to 15 kts. Waves 2 to 4 ft subsiding to 1 to 3 ft after midnight. Partly cloudy. $$ See Lake Michigan Open Lake Forecast for Wednesday through Friday. Wave height forecast is for ice free areas.  675 FZUS53 KLOT 180855 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 355 AM CDT Mon May 18 2026 For waters within five nautical miles of shore on Lake Michigan Waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the waves, along with the average height of the highest 10 percent of the waves which will occasionally be encountered. LMZ740>742-181515- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 355 AM CDT Mon May 18 2026 .TODAY...South winds 15 to 25 kt. Showers likely and a chance of thunderstorms this morning, then a slight chance of showers this afternoon. Waves 2 to 4 ft. .TONIGHT...South winds 15 to 25 kt. Slight chance of showers and thunderstorms in the evening, then chance of showers and thunderstorms overnight. Waves 2 to 4 ft. .TUESDAY...Southwest winds 20 to 25 kt becoming west 15 to 25 kt in the afternoon. Chance of showers and thunderstorms. Waves 3 to 5 ft subsiding to 2 to 4 ft. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest winds 15 to 20 kt becoming north overnight. Slight chance of showers in the evening. Waves 2 to 4 ft. $$ LMZ743>745-181515- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 355 AM CDT Mon May 18 2026 .TODAY...South winds 15 to 25 kt. Showers likely and a chance of thunderstorms. Waves 2 to 4 ft. .TONIGHT...South winds 15 to 25 kt. Slight chance of showers and thunderstorms in the evening, then chance of showers and thunderstorms overnight. Waves 2 to 4 ft. .TUESDAY...Southwest winds 20 to 25 kt becoming west in the afternoon. Chance of showers and thunderstorms in the morning, then showers likely and a chance of thunderstorms in the afternoon. Waves 2 to 4 ft. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest winds 15 to 20 kt becoming north overnight. Chance of showers and slight chance of thunderstorms in the evening. Waves 2 to 4 ft. $$ Ratzer