FZUS52 KCHS 090939 CWFCHS Coastal Waters Forecast National Weather Service Charleston SC 539 AM EDT Thu Jul 9 2026 South Santee River SC to Altamaha Sound GA out 60 NM, including Charleston Harbor and Grays Reef National Marine Sanctuary AMZ300-092300- 539 AM EDT Thu Jul 9 2026 .Synopsis for the coastal waters of south coastal South Carolina and north coastal Georgia... High pressure will persist over the region through this week. $$ AMZ340-092300- Charleston Harbor- 539 AM EDT Thu Jul 9 2026 .TODAY...W winds 10 kt, becoming SW with gusts to 20 kt this afternoon. .TONIGHT...SW winds 10 to 15 kt with gusts to 20 kt. A slight chance of showers and tstms in the evening. .FRI...SW winds 10 to 15 kt. .FRI NIGHT...SW winds 10 to 15 kt with gusts to 20 kt. A slight chance of showers and tstms in the evening. .SAT...SW winds 10 to 15 kt. A chance of showers and tstms in the afternoon. .SAT NIGHT...SW winds 10 to 15 kt. A chance of showers. A chance of tstms, mainly in the evening. .SUN...W winds 5 to 10 kt. Showers and tstms likely. .SUN NIGHT...W winds 5 to 10 kt. Showers with a chance of tstms. .MON...NE winds 5 to 10 kt. Showers with tstms likely. .MON NIGHT...NE winds 5 to 10 kt. Showers likely with a chance of tstms. Winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston Harbor water temperature 87 degrees. $$ AMZ360-092300- Coastal waters from South Santee River to Edisto Beach SC out 20 NM- 539 AM EDT Thu Jul 9 2026 .TODAY...SW winds 10 to 15 kt with gusts to 20 kt, increasing to 15 to 20 kt with gusts to 25 kt late. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 9 seconds. .TONIGHT...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 9 seconds. .FRI...W winds 10 to 15 kt, becoming SW 15 to 20 kt in the afternoon. Seas 3 to 4 ft, building to 4 to 5 ft in the afternoon. Wave Detail: SW 4 ft at 6 seconds and SE 2 ft at 9 seconds, becoming S 4 ft at 7 seconds. .FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. .SAT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft in the afternoon. Wave Detail: S 4 ft at 7 seconds, becoming SW 4 ft at 5 seconds and SE 2 ft at 8 seconds. A slight chance of showers and tstms in the afternoon. .SAT NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 8 seconds. A chance of showers and tstms. .SUN...W winds 10 to 15 kt. Seas 3 to 4 ft. Tstms likely with a slight chance of showers. .SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Showers with a chance of tstms. .MON...N winds 10 to 15 kt. Seas 2 to 3 ft. Showers with tstms likely. .MON NIGHT...NE winds 10 to 15 kt. Seas 3 ft. Showers likely with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ362-092300- Coastal waters from Edisto Beach SC to Savannah GA out 20 NM- 539 AM EDT Thu Jul 9 2026 .TODAY...SW winds 10 to 15 kt with gusts to 20 kt, becoming S with gusts to 20 kt late. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds and SE 2 ft at 9 seconds. .TONIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 2 ft at 9 seconds. A slight chance of showers and tstms in the evening. .FRI...W winds 10 to 15 kt, becoming SW 15 to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: S 3 ft at 6 seconds and SE 2 ft at 9 seconds. .FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 2 ft at 8 seconds. .SAT...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: S 3 ft at5 seconds and SE 2 ft at 8 seconds. .SAT NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 2 ft at 8 seconds. A chance of showers. A chance of tstms, mainly in the evening. .SUN...SW winds 10 to 15 kt. Seas 2 to 3 ft. Showers and tstms likely. .SUN NIGHT...SW winds 5 to 10 kt. Seas 2 ft. Showers with a chance of tstms. .MON...NW winds 10 to 15 kt. Seas 2 ft. Showers with tstms likely. .MON NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Showers with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ364-092300- Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary- 539 AM EDT Thu Jul 9 2026 .TODAY...W winds 10 to 15 kt, becoming S with gusts to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 2 ft at 9 seconds. .TONIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds and SE 2 ft at 9 seconds. A slight chance of showers and tstms in the evening. .FRI...W winds 10 kt, becoming S with gusts to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 2 ft at 9 seconds. .FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 1 foot at 8 seconds. .SAT...SW winds 10 to 15 kt, becoming S with gusts to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 3 ft at 8 seconds. .SAT NIGHT...S winds 15 to 20 kt, becoming SW 10 to 15 kt after midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of showers. A chance of tstms, mainly in the evening. .SUN...SW winds 10 to 15 kt. Seas 2 to 3 ft. Showers and tstms likely. .SUN NIGHT...SW winds 5 to 10 kt. Seas 2 ft. Showers with a chance of tstms. .MON...W winds 5 to 10 kt. Seas 2 ft. Showers with tstms likely. .MON NIGHT...W winds 5 to 10 kt. Seas 2 ft. Showers with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ380-092300- Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM- 539 AM EDT Thu Jul 9 2026 .TODAY...SW winds 10 to 15 kt with gusts to 20 kt, increasing to 15 to 20 kt late. Seas 4 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 9 seconds. .TONIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. .FRI...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: SW 4 ft at 6 seconds and SE 2 ft at 8 seconds. .FRI NIGHT...SW winds 20 kt with gusts to 25 kt. Seas 4 to 5 ft, building to 5 to 6 ft after midnight. Wave Detail: SW 5 ft at 5 seconds and SE 2 ft at 8 seconds, becoming S 5 ft at 7 seconds. .SAT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: S 5 ft at 7 seconds. .SAT NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 8 seconds. A chance of showers and tstms. .SUN...W winds 10 to 15 kt. Seas 4 to 5 ft. A chance of showers and tstms. .SUN NIGHT...SW winds 10 to 15 kt. Seas 3 ft. Showers with tstms likely. .MON...N winds 10 to 15 kt. Seas 3 ft. Showers with a chance of tstms. .MON NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Showers with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ382-092300- Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM- 539 AM EDT Thu Jul 9 2026 .TODAY...SW winds 10 to 15 kt, becoming 15 kt late. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 3 ft at 9 seconds. .TONIGHT...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 3 ft at 9 seconds. .FRI...W winds 10 to 15 kt, becoming SW 15 to 20 kt in the afternoon. Seas 4 to 5 ft, subsiding to 3 to 4 ft in the afternoon. Wave Detail: SW 4 ft at 5 seconds and SE 3 ft at 9 seconds, becoming SW 3 ft at 5 seconds and SE 3 ft at 8 seconds. .FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: S 4 ft at 5 seconds and SE 2 ft at 8 seconds. .SAT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft in the afternoon. Wave Detail: SW 4 ft at 5 seconds and SE 3 ft at 8 seconds, becoming SW 3 ft at 5 seconds and SE 2 ft at 8 seconds. .SAT NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: S 4 ft at 5 seconds and SE 3 ft at 8 seconds. A chance of showers and tstms. .SUN...W winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms. .SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Showers with a chance of tstms. .MON...W winds 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms. .MON NIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft. Showers with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ384-092300- Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM- 539 AM EDT Thu Jul 9 2026 .TODAY...SW winds 10 to 15 kt with gusts to 20 kt, becoming S late. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 3 ft at 9 seconds. .TONIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 3 ft at 9 seconds. .FRI...SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds and SE 3 ft at 8 seconds. .FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 3 ft at 8 seconds. .SAT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds and SE 3 ft at 8 seconds. .SAT NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 3 ft at 8 seconds. A slight chance of showers and tstms. .SUN...SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms. .SUN NIGHT...SW winds 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms. .MON...W winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms. .MON NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Showers with a chance of tstms. Winds and seas higher in and near tstms. $$