FZUS63 KMQT 221401 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1000 AM EDT Sat Aug 22 2026 For waters beyond 5 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. .SYNOPSIS... Pressure rises continue over Lake Superior behind an exiting 29.9 inch trough. This is followed by 30.1 inch ridging for the latter part of the weekend into early next week via a 30.2 inch parent high from the Canadian Prairies that drops down into the Ohio River Valley by late Monday, weakening to 30.1 inches as it does so. A 29.7 inch low over the Canadian Prairies Monday night then drops southeast towards Lake Superior, arriving early Wednesday morning. The low shifts east Wednesday night with weak ridging of 29.9 inches building over the lake on Thursday. LSZ162-222000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1000 AM EDT Sat Aug 22 2026 /900 AM CDT Sat Aug 22 2026/ .REST OF TODAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet. .TONIGHT...North winds 10 to 20 knots. Waves calm to 2 feet. .SUNDAY...North winds 5 to 15 knots veering south in the afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots becoming northwest less than 10 knots after midnight. Waves calm to 2 feet. .MONDAY...North winds less than 10 knots becoming southeast 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots becoming southeast less than 10 knots after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots veering west. A chance of showers and thunderstorms. Waves calm to 2 feet. .WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves calm to 2 feet. $$ LSZ263-222000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1000 AM EDT Sat Aug 22 2026 .REST OF TODAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon, then diminishing to 5 to 15 knots late. Waves calm to 2 feet. .TONIGHT...North winds 10 to 20 knots. Waves building to 2 to 4 feet. .SUNDAY...North winds 10 to 20 knots becoming west 5 to 15 knots late. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots veering northwest after midnight. Waves calm to 2 feet. .MONDAY...North winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southwest winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots veering southwest. A chance of showers. A chance of thunderstorms. Showers likely. Waves calm to 2 feet. .WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ264-222000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1000 AM EDT Sat Aug 22 2026 .REST OF TODAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet building to 1 to 3 feet, then subsiding to calm to 2 feet. .TONIGHT...North winds 10 to 20 knots increasing to 15 to 25 knots after midnight, then diminishing to 10 to 20 knots late. Waves building to 2 to 4 feet. .SUNDAY...North winds 10 to 20 knots backing northwest late. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves calm to 2 feet. .MONDAY...North winds 5 to 15 knots backing west by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots veering south. A chance of thunderstorms. Showers likely. Waves calm to 2 feet. .WEDNESDAY...West winds 5 to 15 knots veering northwest. A chance of showers. Waves calm to 2 feet. $$ LSZ265-222000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1000 AM EDT Sat Aug 22 2026 .REST OF TODAY...Northwest winds 20 to 30 knots. Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet. .TONIGHT...Northwest winds 20 to 30 knots veering north after midnight. Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots backing northwest late. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .SUNDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding to 1 to 3 feet. .MONDAY...Northwest winds 10 to 20 knots becoming north 5 to 15 knots by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots becoming south 15 to 25 knots. Showers likely and a chance of thunderstorms. Waves calm to 2 feet. .WEDNESDAY...West winds 15 to 25 knots veering northwest. A chance of showers. Waves calm to 2 feet. $$ LSZ266-222000- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- 1000 AM EDT Sat Aug 22 2026 .REST OF TODAY...Northwest winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon. Patchy fog by late morning. Sprinkles by late morning. Waves 2 to 4 feet building to 3 to 6 feet occasionally to 8 feet. .TONIGHT...Northwest winds 20 to 30 knots veering north after midnight. Waves 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots increasing to 30 knots with a few gale force gusts to 35 knots possible in the afternoon, then backing northwest late. Waves building to 4 to 8 feet occasionally to 10 feet. .SUNDAY NIGHT...Northwest winds 20 to 30 knots becoming north 15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet. .MONDAY...North winds 10 to 20 knots backing northwest by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves calm to 2 feet. .TUESDAY...South winds 10 to 20 knots. Showers likely and a chance of thunderstorms. Waves building to 1 to 3 feet. .WEDNESDAY...West winds 10 to 20 knots veering northwest. Showers likely. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. $$ LSZ267-222000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1000 AM EDT Sat Aug 22 2026 .REST OF TODAY...Northwest winds 10 to 20 knots increasing to 20 to 30 knots. Patchy fog. A slight chance of showers. Waves calm to 2 feet building to 3 to 5 feet occasionally to 7 feet. .TONIGHT...Northwest winds 20 to 30 knots veering north after midnight. A slight chance of showers after midnight. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots backing northwest in the afternoon, then increasing to 30 knots with a few gale force gusts to 35 knots possible late. A slight chance of showers. Waves building to 5 to 8 feet occasionally to 10 feet. .SUNDAY NIGHT...Northwest winds 20 to 30 knots veering north after midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .MONDAY...Northwest winds 15 to 25 knots. Waves subsiding to 2 to 4 feet. .MONDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots veering south. Showers likely. Waves building to 1 to 3 feet. .WEDNESDAY...South winds 10 to 20 knots veering west. Showers likely. A chance of thunderstorms. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ261-222000- MAFOR 2215/ Superior West 11720 13710 14820. Waves 2 feet or less. Superior North Central 14720 14830. Waves 1 to 2 feet this afternoon. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 4 feet Sunday morning. Superior South Central 14740 14840. Waves 2 to 4 feet building to 3 to 5 feet this afternoon. Waves 3 to 5 feet tonight. Waves 4 to 7 feet Sunday morning. Superior East 11710 11730 12740 13830 11840. Waves 1 to 3 feet building to 2 to 4 feet this afternoon. Waves 3 to 6 feet tonight and Sunday morning. $$ WFO MQT Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes