FZUS52 KCHS 191230 CWFCHS Coastal Waters Forecast National Weather Service Charleston SC 830 AM EDT Sun Jul 19 2026 South Santee River SC to Altamaha Sound GA out 60 NM, including Charleston Harbor and Grays Reef National Marine Sanctuary AMZ300-200230- 830 AM EDT Sun Jul 19 2026 .Synopsis for the coastal waters of south coastal South Carolina and north coastal Georgia... High pressure will become the more prominent feature across the western Atlantic this weekend while weak low pressure remains inland through early next week. $$ AMZ340-200230- Charleston Harbor- 830 AM EDT Sun Jul 19 2026 .TODAY...SW winds 10 to 15 kt with gusts to 20 kt. .TONIGHT...SW winds 10 to 15 kt with gusts to 20 kt. .MON...SW winds 10 to 15 kt. .MON NIGHT...S winds 10 to 15 kt with gusts to 20 kt. A chance of showers with a slight chance of tstms after midnight. .TUE...SW winds 10 to 15 kt, becoming S 15 to 20 kt in the afternoon. Waves 1 to 2 ft. A chance of showers and tstms, mainly in the morning. .TUE NIGHT...S winds 15 kt with gusts to 20 kt. A chance of showers and tstms. .WED...SW winds 15 to 20 kt. Waves 1 to 2 ft. A slight chance of showers and tstms. .WED NIGHT...SW winds 15 to 20 kt. Waves 1 to 2 ft. A chance of showers and tstms. .THU...SW winds 10 to 15 kt. Showers and tstms likely. .THU NIGHT...SE winds 5 to 10 kt. Showers likely with a chance of tstms. Winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston Harbor water temperature 87 degrees. $$ AMZ360-200230- Coastal waters from South Santee River to Edisto Beach SC out 20 NM- 830 AM EDT Sun Jul 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .TODAY...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft this afternoon. Wave Detail: S 5 ft at 6 seconds, becoming SW 4 ft at 6 seconds. .TONIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds. .MON...SW winds 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds. .MON NIGHT...S winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds. A chance of showers with a slight chance of tstms after midnight. .TUE...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: S 5 ft at 6 seconds. A chance of showers and tstms. .TUE NIGHT...S winds 20 to 25 kt. Seas 4 to 6 ft, building to 5 to 6 ft after midnight. Wave Detail: S 6 ft at 6 seconds. A chance of showers and tstms. .WED...SW winds 20 to 25 kt. Seas 5 to 6 ft. A slight chance of showers and tstms. .WED NIGHT...SW winds 20 to 25 kt. Seas 5 to 6 ft. A chance of showers and tstms. .THU...SW winds 15 to 20 kt. Seas 4 to 5 ft. A chance of showers and tstms. .THU NIGHT...SE winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ362-200230- Coastal waters from Edisto Beach SC to Savannah GA out 20 NM- 830 AM EDT Sun Jul 19 2026 .TODAY...SW winds 10 to 15 kt, becoming S late. Seas 3 to 4 ft. Wave Detail: S 4 ft at 6 seconds. .TONIGHT...S winds 15 to 20 kt. Seas 3 ft. Wave Detail: S 3 ft at 5 seconds. .MON...S winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds. .MON NIGHT...S winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds. A slight chance of showers and tstms in the evening, then a chance of showers and tstms after midnight. .TUE...S winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft, building to 4 to 5 ft in the afternoon. Wave Detail: S 4 ft at 6 seconds, becoming S 5 ft at 6 seconds. A chance of showers and tstms, mainly in the morning. .TUE NIGHT...S winds 20 to 25 kt. Seas 5 to 6 ft. Wave Detail: S 6 ft at 7 seconds. A chance of showers and tstms. .WED...SW winds 20 to 25 kt. Seas 4 to 6 ft. A slight chance of showers and tstms. .WED NIGHT...S winds 20 to 25 kt. Seas 4 to 6 ft. A chance of showers and tstms. .THU...SW winds 15 to 20 kt. Seas 4 to 5 ft. A chance of showers and tstms. .THU NIGHT...S winds 10 to 15 kt. Seas 3 ft. Showers likely with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ364-200230- Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary- 830 AM EDT Sun Jul 19 2026 .TODAY...SW winds 10 to 15 kt, becoming S with gusts to 20 kt late. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 6 seconds. .TONIGHT...S winds 15 to 20 kt. Seas 3 ft. Wave Detail: S 3 ft at 5 seconds and E 1 foot at 8 seconds. .MON...S winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds. .MON NIGHT...S winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 5 seconds. A slight chance of tstms. A slight chance of showers in the evening, then a chance of showers after midnight. .TUE...S winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft, building to 4 to 5 ft in the afternoon. Wave Detail: S 4 ft at 5 seconds, becoming S 5 ft at 5 seconds. A slight chance of tstms. A chance of showers, mainly in the morning. .TUE NIGHT...S winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Seas 4 to 5 ft. Wave Detail: S 5 ft at 6 seconds. A slight chance of showers and tstms. .WED...S winds 20 to 25 kt. Seas 4 to 5 ft. A slight chance of showers and tstms. .WED NIGHT...S winds 20 to 25 kt. Seas 4 to 5 ft. A chance of showers with a slight chance of tstms. .THU...SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms. .THU NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. $$ AMZ380-200230- Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM- 830 AM EDT Sun Jul 19 2026 .TODAY...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft this afternoon. Wave Detail: SW 5 ft at 6 seconds, becoming SW 4 ft at 6 seconds. .TONIGHT...SW winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and E 1 foot at 8 seconds. .MON...SW winds 15 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds. A slight chance of showers and tstms in the morning. .MON NIGHT...S winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft, building to 4 to 5 ft after midnight. Wave Detail: SW 4 ft at 5 seconds, becoming S 4 ft at 6 seconds. A chance of showers and tstms after midnight. .TUE...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: S 5 ft at 6 seconds. A chance of showers and tstms. .TUE NIGHT...S winds 20 to 25 kt with gusts to 30 kt. Seas 5 to 6 ft, building to 6 to 7 ft after midnight. Wave Detail: S 6 ft at 6 seconds, becoming S 7 ft at 7 seconds. A slight chance of showers and tstms in the evening, then a chance of showers and tstms after midnight. .WED...SW winds 20 to 25 kt. Seas 6 to 7 ft. A slight chance of showers and tstms. .WED NIGHT...S winds 20 to 25 kt. Seas 6 ft. A chance of showers and tstms. .THU...SW winds 15 to 20 kt. Seas 4 to 6 ft. A chance of showers and tstms. .THU NIGHT...S winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ382-200230- Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM- 830 AM EDT Sun Jul 19 2026 .TODAY...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft this afternoon. Wave Detail: SW 4 ft at 6 seconds, becoming SW 3 ft at 5 seconds and SE 1 foot at 8 seconds. .TONIGHT...S winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and E 1 foot at 8 seconds. .MON...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 5 seconds. .MON NIGHT...S winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds. A chance of showers and tstms after midnight. .TUE...S winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: S 5 ft at 6 seconds. A chance of showers and tstms, mainly in the morning. .TUE NIGHT...S winds 20 to 25 kt with gusts to 30 kt. Seas 5 to 6 ft. Wave Detail: S 6 ft at 7 seconds. A chance of showers and tstms. .WED...SW winds 20 to 25 kt. Seas 5 to 6 ft. A slight chance of showers and tstms. .WED NIGHT...S winds 20 to 25 kt. Seas 5 to 6 ft. A chance of showers and tstms. .THU...SW winds 15 to 20 kt. Seas 4 to 5 ft. A chance of showers and tstms. .THU NIGHT...S winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. $$ AMZ384-200230- Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM- 830 AM EDT Sun Jul 19 2026 .TODAY...SW winds 10 to 15 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft this afternoon. Wave Detail: S 4 ft at 5 seconds and SE 1 foot at 8 seconds, becoming S 3 ft at 5 seconds and SE 1 foot at 8 seconds. .TONIGHT...S winds 15 kt with gusts to 20 kt. Seas 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 1 foot at 8 seconds. .MON...S winds 10 to 15 kt. Seas 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 1 foot at 8 seconds. .MON NIGHT...S winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 6 seconds. A chance of showers and tstms after midnight. .TUE...S winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: SE 5 ft at 6 seconds. A chance of showers and tstms, mainly in the morning. .TUE NIGHT...S winds 15 to 20 kt with gusts to 25 kt. Seas 5 ft. Wave Detail: SE 5 ft at 6 seconds. A slight chance of showers and tstms. .WED...S winds 15 to 20 kt. Seas 4 to 5 ft. .WED NIGHT...S winds 20 to 25 kt. Seas 4 to 5 ft. A chance of showers and tstms. .THU...SW winds 15 kt. Seas 3 to 4 ft. A chance of showers and tstms. .THU NIGHT...S winds 10 to 15 kt. Seas 3 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. $$