FZUS52 KCHS 182139 CWFCHS Coastal Waters Forecast National Weather Service Charleston SC 539 PM EDT Mon May 18 2026 South Santee River SC to Altamaha Sound GA out 60 NM, including Charleston Harbor and Grays Reef National Marine Sanctuary AMZ300-191100- 539 PM EDT Mon May 18 2026 .Synopsis for the coastal waters of south coastal South Carolina and north coastal Georgia... High pressure will extend across the region before a cold front approaches the area near the end of the week. $$ AMZ340-191100- Charleston Harbor- 539 PM EDT Mon May 18 2026 .TONIGHT...SE winds 5 to 10 kt, diminishing to 5 kt late. .TUE...E winds 5 kt, becoming SE in the afternoon. .TUE NIGHT...SE winds 5 to 10 kt, becoming S after midnight. .WED...SE winds 5 kt, increasing to 5 to 10 kt in the afternoon. .WED NIGHT...S winds 5 to 10 kt. .THU...S winds 5 kt, becoming SE in the afternoon. .THU NIGHT...S winds 5 to 10 kt. A slight chance of showers after midnight. .FRI...SE winds 5 to 10 kt. A chance of showers with a slight chance of tstms. .FRI NIGHT...SE winds 5 to 10 kt. A slight chance of showers and tstms. .SAT...SE winds 5 to 10 kt. A slight chance of showers and tstms. .SAT NIGHT...S winds 5 to 10 kt. A slight chance of showers and tstms. Winds and waves higher in and near tstms. $$ AMZ360-191100- Coastal waters from South Santee River to Edisto Beach SC out 20 NM- 539 PM EDT Mon May 18 2026 .TONIGHT...SE winds 5 to 10 kt, diminishing to 5 kt late. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .TUE...E winds 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .TUE NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .WED...E winds 5 kt, becoming SE in the afternoon. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .WED NIGHT...S winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .THU...S winds 5 kt, becoming SE in the afternoon. Seas 3 ft. Wave Detail: SE 3 ft at 9 seconds. .THU NIGHT...SE winds 5 to 10 kt. Seas 3 ft. A slight chance of showers and tstms after midnight. .FRI...SE winds 5 to 10 kt. Seas 3 to 4 ft. A chance of showers with a slight chance of tstms. .FRI NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. A chance of showers with a slight chance of tstms. .SAT...SE winds 5 to 10 kt. Seas 3 ft. A slight chance of showers and tstms. .SAT NIGHT...S winds 5 to 10 kt. Seas 3 ft. A slight chance of showers and tstms. Winds and seas higher in and near tstms. $$ AMZ362-191100- Coastal waters from Edisto Beach SC to Savannah GA out 20 NM- 539 PM EDT Mon May 18 2026 .TONIGHT...SE winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .TUE...E winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .TUE NIGHT...E winds 5 to 10 kt, becoming SE after midnight. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .WED...E winds 5 kt, becoming SE in the afternoon. Seas 3 ft. Wave Detail: SE 3 ft at 9 seconds. .WED NIGHT...S winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 9 seconds. .THU...S winds 5 kt, becoming SE in the afternoon. Seas 3 ft. Wave Detail: SE 3 ft at 9 seconds. .THU NIGHT...SE winds 5 to 10 kt. Seas 3 ft. .FRI...SE winds 5 to 10 kt. Seas 3 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas 3 ft. A slight chance of showers and tstms. .SAT...SE winds 5 to 10 kt. Seas 3 ft. .SAT NIGHT...SE winds 5 to 10 kt. Seas 3 ft. A slight chance of showers. Winds and seas higher in and near tstms. $$ AMZ364-191100- Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary- 539 PM EDT Mon May 18 2026 .TONIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .TUE...E winds 5 to 10kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .TUE NIGHT...E winds 10 kt, becoming SE after midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 8 seconds. .WED...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .WED NIGHT...SE winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .THU...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds and E 1 foot at 9 seconds. .THU NIGHT...SE winds 5 to 10 kt. Seas 3 ft. .FRI...SE winds 5 to 10 kt. Seas 3 ft. .FRI NIGHT...SE winds 10 kt. Seas 3 ft. .SAT...SE winds 5 to 10 kt. Seas 3 ft. .SAT NIGHT...SE winds 10 kt. Seas 3 ft. A slight chance of showers. $$ AMZ380-191100- Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM- 539 PM EDT Mon May 18 2026 .TONIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds. .TUE...SE winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .TUE NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds. A slight chance of showers after midnight. .WED...SE winds 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds. A slight chance of showers in the morning. .WED NIGHT...S winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 9 seconds. A slight chance of showers after midnight. .THU...S winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 9 seconds. A slight chance of tstms in the morning. A chance of showers. .THU NIGHT...SE winds 10 kt. Seas 3 to 4 ft. A slight chance of tstms. A slight chance of showers in the evening, then a chance of showers after midnight. .FRI...SE winds 5 to 10 kt. Seas 4 ft. A chance of showers with a slight chance of tstms. .FRI NIGHT...SE winds 10 to 15 kt. Seas 4 ft. A chance of showers with a slight chance of tstms. .SAT...SE winds 10 kt. Seas 4 ft. A chance of showers with a slight chance of tstms. .SAT NIGHT...S winds 10 to 15 kt. Seas 4 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. $$ AMZ382-191100- Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM- 539 PM EDT Mon May 18 2026 .TONIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. .TUE...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. .TUE NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 9 seconds. .WED...E winds 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 9 seconds. .WED NIGHT...S winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 9 seconds. .THU...S winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 9 seconds and E 2 ft at 9 seconds. A slight chance of showers in the morning. .THU NIGHT...SE winds 10 kt. Seas 3 to 4 ft. A slight chance of showers and tstms after midnight. .FRI...SE winds 5 to 10 kt. Seas 3 to 4 ft. A chance of showers with a slight chance of tstms. .FRI NIGHT...SE winds 10 to 15 kt. Seas 4 ft. A chance of showers with a slight chance of tstms. .SAT...SE winds 5 to 10 kt. Seas 3 to 4 ft. A chance of showers with a slight chance of tstms. .SAT NIGHT...SE winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers and tstms. Winds and seas higher in and near tstms. $$ AMZ384-191100- Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM- 539 PM EDT Mon May 18 2026 .TONIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .TUE...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .TUE NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE3 ft at 8 seconds and E 1 foot at 9 seconds. .WED...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .WED NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .THU...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 9 seconds and E 1 foot at 9 seconds. .THU NIGHT...SE winds 10 kt. Seas 3 to 4 ft. A slight chance of showers after midnight. .FRI...SE winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance of showers. .FRI NIGHT...SE winds 10 kt. Seas 3 to 4 ft. A slight chance of showers and tstms. .SAT...SE winds 5 to 10 kt. Seas 3 to 4 ft. .SAT NIGHT...SE winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers and tstms. Winds and seas higher in and near tstms. $$