FZUS52 KCHS 210619 CWFCHS Coastal Waters Forecast National Weather Service Charleston SC 218 AM EDT Sun Jun 21 2026 South Santee River SC to Altamaha Sound GA out 60 NM, including Charleston Harbor and Grays Reef National Marine Sanctuary AMZ300-212000- 218 AM EDT Sun Jun 21 2026 .Synopsis for the coastal waters of south coastal South Carolina and north coastal Georgia... Broad high pressure will reside over the area through Monday. A cold front will approach the area Monday night into Tuesday and stall across southeast South Carolina and southeast Georgia through the end of the week. $$ AMZ340-212000- Charleston Harbor- 219 AM EDT Sun Jun 21 2026 .REST OF TONIGHT...W winds 5 kt. .SUN...W winds 5 kt, becoming S in the afternoon. A slight chance of showers and tstms in the afternoon. .SUN NIGHT...SW winds 5 to 10 kt. .MON...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts to 20 kt in the afternoon. .MON NIGHT...SW winds 10 to 15 kt. A slight chance of showers and tstms in the evening. .TUE...W winds 10 kt, becoming SW with gusts to 20 kt in the afternoon. A slight chance of showers. A slight chance of tstms in the afternoon. .TUE NIGHT...SW winds 10 to 15 kt with gusts to 20 kt, becoming W 5 kt after midnight. A slight chance of showers and tstms. .WED...NE winds 5 to 10 kt. A chance of showers and tstms. .WED NIGHT...S winds 5 to 10 kt. A chance of showers and tstms. .THU...S winds 5 to 10 kt. A chance of showers and tstms. .THU NIGHT...SW winds 5 to 10 kt. A chance of showers and tstms. Winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston Harbor water temperature 82 degrees. $$ AMZ360-212000- Coastal waters from South Santee River to Edisto Beach SC out 20 NM- 219 AM EDT Sun Jun 21 2026 .REST OF TONIGHT...W winds 5 kt. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 4 seconds. .SUN...W winds 5 kt, becoming S in the afternoon. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds. .SUN NIGHT...SW winds 10 kt. Seas 2 ft. Wave Detail: S 2 ft at 6 seconds. .MON...W winds 10 to 15 kt, becoming SW 15 to 20 kt with gusts to 25 kt in the afternoon. Seas 2 ft, building to 3 to 4 ft in the afternoon. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 7 seconds, becoming SW 3 ft at 4 seconds and SE 1 foot at 7 seconds. .MON NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 6 seconds. A slight chance of showers and tstms. .TUE...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 6 seconds. A slight chance of showers and tstms in the afternoon. .TUE NIGHT...SW winds 15 to 20 kt with gusts to 25 kt, becoming W 10 to 15 kt after midnight. Seas 3 to 4 ft, subsiding to 2 to 3 ft after midnight. A slight chance of showers and tstms. .WED...NE winds 5 to 10 kt. Seas 2 ft. .WED NIGHT...SE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms. .THU...S winds 10 to 15 kt. Seas 2 ft. A slight chance of showers and tstms. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. $$ AMZ362-212000- Coastal waters from Edisto Beach SC to Savannah GA out 20 NM- 219 AM EDT Sun Jun 21 2026 .REST OF TONIGHT...W winds 5 kt. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 3 seconds. .SUN...W winds 5 kt, becoming SW in the afternoon. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 3 seconds. .SUN NIGHT...SW winds 10 kt. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 4 seconds. A slight chance of showers and tstms in the evening. .MON...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 7 seconds. .MON NIGHT...SW winds 15 kt with gusts to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 1 foot at 7 seconds. .TUE...SW winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 7 seconds. A chance of showers and tstms in the afternoon. .TUE NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms, mainly in the evening. .WED...W winds 5 to 10 kt. Seas 2 ft. .WED NIGHT...S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms. .THU...SW winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. $$ AMZ364-212000- Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary- 219 AM EDT Sun Jun 21 2026 .REST OF TONIGHT...W winds 5 kt. Seas 2 ft. Wave Detail: SW 1 foot at 2 seconds and SE 1 foot at 7 seconds. .SUN...W winds 5 to 10 kt, becoming SW in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: SW 1 foot at 4 seconds and SE 1 foot at 7 seconds. .SUN NIGHT...SW winds 10 kt. Seas 2 ft. Wave Detail: S 1 foot at 3 seconds and SE 1 foot at 7 seconds. A chance of showers with a slight chance of tstms in the evening. .MON...SW winds 10 to 15 kt. Seas 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 7 seconds. A slight chance of showers and tstms in the afternoon. .MON NIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 7 seconds. A slight chance of showers and tstms in the evening. .TUE...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 7 seconds. A chance of showers and tstms in the afternoon. .TUE NIGHT...W winds 10 to 15 kt. Seas 2 ft. A chance of showers and tstms, mainly in the evening. .WED...SW winds 5 to 10 kt. Seas 2 ft. .WED NIGHT...S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms. .THU...SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms. .THU NIGHT...SW winds 10 kt. Seas 2 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. $$ AMZ380-212000- Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM- 219 AM EDT Sun Jun 21 2026 .REST OF TONIGHT...W winds 5 kt. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 4 seconds. .SUN...NW winds 5 kt, becoming S in the afternoon. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 4 seconds. .SUN NIGHT...SW winds 5 to 10 kt. Seas 2 ft. Wave Detail: S 2 ft at 6 seconds. .MON...W winds 10 to 15 kt, becoming SW 15 to 20 kt in the afternoon. Seas 2 to 3 ft, building to 3 to 4 ft in the afternoon. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 7 seconds, becoming SW 3 ft at 4 seconds and SE 2 ft at 7 seconds. A slight chance of showers and tstms in the morning. .MON NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: S 4 ft at 6 seconds. A slight chance of showers and tstms. .TUE...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 8 seconds. A slight chance of showers and tstms. .TUE NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after midnight. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight. A chance of showers and tstms. .WED...N winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms. .THU...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers with a slight chance of tstms. .THU NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ382-212000- Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM- 219 AM EDT Sun Jun 21 2026 .REST OF TONIGHT...W winds 5 kt. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at 3 seconds. .SUN...NW winds 5 to 10 kt, becoming SW in the afternoon. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at 4 seconds. .SUN NIGHT...SW winds 10 kt. Seas 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at 7 seconds. .MON...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 7 seconds. A slight chance of showers and tstms in the morning. .MON NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 6 seconds. A slight chance of showers and tstms. .TUE...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: W 3 ft at 5 seconds and SE 1 foot at 7 seconds. A slight chance of tstms. A slight chance of showers in the morning, then a chance of showers in the afternoon. .TUE NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after midnight. Seas 3 to 4 ft, subsiding to 2 to 3 ft after midnight. A chance of showers and tstms. .WED...W winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms. .THU...SW winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. $$ AMZ384-212000- Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM- 219 AM EDT Sun Jun 21 2026 .REST OF TONIGHT...W winds 5 kt. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at 3 seconds. .SUN...W winds 5 to 10 kt, becoming SW in the afternoon. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at 4 seconds. .SUN NIGHT...SW winds 5 to 10 kt. Seas 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 3 seconds. A slight chance of showers and tstms in the evening. .MON...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at 7 seconds. A slight chance of showers and tstms in the morning. .MON NIGHT...SW winds 15 kt with gusts to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 7 seconds. .TUE...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 2 ft at 7 seconds. A slight chance of showers and tstms in the afternoon. .TUE NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms. .WED...W winds 5 to 10 kt. Seas 2 ft. .WED NIGHT...S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms. .THU...SW winds 5 to 10 kt. Seas 2 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. $$