FZUS52 KCHS 180913 CWFCHS Coastal Waters Forecast National Weather Service Charleston SC 513 AM 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 AMZ300-182315- 513 AM 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. $$ AMZ340-182315- Charleston Harbor- 513 AM EDT Mon May 18 2026 .TODAY...S winds 5 kt or less, becoming SE 10 to 15 kt. .TONIGHT...SE winds 5 to 10 kt, diminishing to 5 kt after midnight. .TUE...SE winds 5 kt, increasing to 5 to 10 kt in the afternoon. .TUE NIGHT...SE winds 5 to 10 kt, becoming S after midnight. .WED...E winds 5 kt, becoming SE in the afternoon. .WED NIGHT...S winds 5 to 10 kt. .THU...S winds 5 to 10 kt. .THU NIGHT...SE winds 5 to 10 kt. A chance of showers with a slight chance of tstms. .FRI...SE winds 5 to 10 kt. A chance of showers and tstms. .FRI NIGHT...SE winds 5 to 10 kt. A chance of showers. Winds and waves higher in and near tstms. $$ AMZ360-182315- Coastal waters from South Santee River to Edisto Beach SC out 20 NM- 513 AM EDT Mon May 18 2026 .TODAY...SE winds 5 kt, becoming E 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. .TONIGHT...SE winds 5 to 10 kt. Seas 2 to 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 2 to 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...SE winds 5 kt, increasing to 5 to 10 kt 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 to 10 kt. Seas 3 ft. .THU NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. A chance of showers with a slight chance of tstms. .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. Winds and seas higher in and near tstms. $$ AMZ362-182315- Coastal waters from Edisto Beach SC to Savannah GA out 20 NM- 513 AM EDT Mon May 18 2026 .TODAY...SE winds 5 kt, becoming E 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. .TONIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. .TUE...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. .TUE NIGHT...SE winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .WED...E winds 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .WED NIGHT...S winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .THU...SE winds 5 to 10 kt. Seas 3 ft. .THU NIGHT...SE winds 5 to 10 kt. Seas 3 ft. A slight chance of showers and tstms. .FRI...SE winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance of showers. .FRI NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance of showers. Winds and seas higher in and near tstms. $$ AMZ364-182315- Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary- 513 AM EDT Mon May 18 2026 .TODAY...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. .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 10 kt. Seas 2 to 3 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 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 8 seconds. .WED...E winds 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 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. .THU NIGHT...SE winds 5 to 10 kt. Seas 3 ft. A slight chance of showers and tstms. .FRI...SE winds 10 to 15 kt. Seas 3 ft. A slight chance of showers. .FRI NIGHT...SE winds 10 to 15 kt. Seas 3 ft. Winds and seas higher in and near tstms. $$ AMZ380-182315- Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM- 513 AM EDT Mon May 18 2026 .TODAY...SE winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .TONIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds. .TUE...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. .TUE NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. .WED...SE winds 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. A slight chance of showers in the morning. .WED NIGHT...S winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 9 seconds. A slight chance of showers after midnight. .THU...S winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance of showers. .THU NIGHT...SE winds 10 kt. Seas 4 ft. A chance of showers and tstms. .FRI...SE winds 5 to 10 kt. Seas 4 ft. A chance of showers with a slight chance of tstms. .FRI NIGHT...SE winds 10 to 15 kt. Seas 4 to 5 ft. A chance of showers with a slight chance of tstms. Winds and seas higher in and near tstms. $$ AMZ382-182315- Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM- 513 AM EDT Mon May 18 2026 .TODAY...SE winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds. .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 8 seconds. .WED...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 9 seconds. .WED NIGHT...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. .THU...SE winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance of showers. .THU NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. A chance of showers and tstms. .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 to 5 ft. A chance of showers with a slight chance of tstms. Winds and seas higher in and near tstms. $$ AMZ384-182315- Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM- 513 AM EDT Mon May 18 2026 .TODAY...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .TONIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .TUE...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .TUE NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .WED...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .WED NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 9 seconds. .THU...SE winds 5 to 10 kt. Seas 3 to 4 ft. .THU NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance of showers and tstms. .FRI...SE winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance of showers and tstms. .FRI NIGHT...SE winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers. Winds and seas higher in and near tstms. $$