FZUS52 KCHS 091830 CWFCHS Coastal Waters Forecast National Weather Service Charleston SC 230 PM 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 AMZ300-100800- 230 PM 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 the work week. A cold front may push south over the area late this weekend. $$ AMZ340-100800- Charleston Harbor- 230 PM EDT Thu Jul 9 2026 .THIS AFTERNOON...SW winds 15 kt with gusts to 20 kt. A slight chance of showers and tstms. .TONIGHT...SW winds 10 to 15 kt with gusts to 20 kt. .FRI...SW winds 10 to 15 kt. A slight chance of showers and tstms in the afternoon. .FRI NIGHT...SW winds 10 to 15 kt with gusts to 20 kt. A slight chance of showers and tstms in the evening. .SAT...W winds 10 kt, becoming SW 15 to 20 kt with gusts to 25 kt in the afternoon. Waves 1 to 2 ft. A slight chance of showers and tstms in the afternoon. .SAT NIGHT...SW winds 15 to 20 kt with gusts to 25 kt, diminishing to 5 to 10 kt after midnight. Waves 1 to 2 ft. A chance of showers and tstms. .SUN...W winds 5 to 10 kt. Showers with tstms likely. .SUN NIGHT...W winds 5 kt. Showers with a chance of tstms. .MON...NE winds 5 to 10 kt. Showers with tstms likely. .MON NIGHT...NE winds 5 to 10 kt. Showers likely with a chance of tstms. Winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston Harbor water temperature 88 degrees. $$ AMZ360-100800- Coastal waters from South Santee River to Edisto Beach SC out 20 NM- 230 PM EDT Thu Jul 9 2026 .THIS AFTERNOON...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. .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. Wave Detail: SW 4 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 4 to 5 ft. Wave Detail: S 5 ft at 5 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. .SAT NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 9 seconds, becoming SW 4 ft at 6 seconds and SE 1 foot at 9 seconds. A chance of showers and tstms. .SUN...W winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely with a chance of tstms. .SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Showers with a chance of tstms. .MON...NE 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 with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ362-100800- Coastal waters from Edisto Beach SC to Savannah GA out 20 NM- 230 PM EDT Thu Jul 9 2026 .THIS AFTERNOON...S winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds and SE 2 ft at 9 seconds. A slight chance of showers and tstms late. .TONIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 2 ft at 9 seconds. .FRI...W winds 10 to 15 kt, becoming SW 15 to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds and SE 2 ft at 9 seconds. .FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 2 ft at 8 seconds. .SAT...W winds 10 to 15 kt, becoming SW 15 to20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: S 3 ft at 7 seconds. .SAT NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 1 foot at 8 seconds. A slight chance of showers and tstms. .SUN...W winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms. .SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Showers with a chance of tstms. .MON...N winds 5 to 10 kt. Seas 2 ft. Showers with tstms likely. .MON NIGHT...E winds 10 to 15 kt. Seas 2 to 3 ft. Showers with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ364-100800- Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary- 230 PM EDT Thu Jul 9 2026 .THIS AFTERNOON...S winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 2 ft at 9 seconds. A slight chance of showers and tstms late. .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...W 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...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 1 foot at 8 seconds. A slight chance of showers and tstms in the evening. .SUN...SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms. .SUN NIGHT...W 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. $$ AMZ380-100800- Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM- 230 PM EDT Thu Jul 9 2026 .THIS AFTERNOON...SW winds 15 to 20 kt. Seas 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 9 seconds. .TONIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. .FRI...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: SW 4 ft at 6 seconds and SE 2 ft at 8 seconds. .FRI NIGHT...SW winds 20 kt with gusts to 25 kt. Seas 4 to 5 ft, building to 5 to 6 ft after midnight. Wave Detail: SW 5 ft at 5 seconds and SE 2 ft at 8 seconds, becoming S 5 ft at 7 seconds. .SAT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 6 ft, subsiding to 4 to 5 ft in the afternoon. Wave Detail: S 5 ft at 7 seconds, becoming S 4 ft at 7 seconds. .SAT NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 8 seconds. A chance of showers and tstms. .SUN...W winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms. .SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Showers with tstms likely. .MON...N winds 10 to 15 kt. Seas 3 ft. Showers likely with a chance of tstms. .MON NIGHT...NE winds 10 to 15 kt. Seas 3 ft. Showers with a chance of tstms. Winds and seas higher in and near tstms. $$ AMZ382-100800- Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM- 230 PM EDT Thu Jul 9 2026 .THIS AFTERNOON...SW winds 15 kt with gusts to 20 kt. 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, building to 4 to 5 ft after midnight. 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 4 to 5 ft, subsiding to 3 to 4 ft in the afternoon. Wave Detail: SW 4 ft at 6 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 2 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 slight 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...W winds 10 to 15 kt. Seas 2 to 3 ft. Showers with a chance of tstms. .MON...NW 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. $$ AMZ384-100800- Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM- 230 PM EDT Thu Jul 9 2026 .THIS AFTERNOON...SW winds 10 to 15 kt. Seas 3 ft. Wave Detail: SE 3 ft at 9 seconds and SW 2 ft at 5 seconds. .TONIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 3 ft at 9 seconds. .FRI...SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 3 ft at 8 seconds. .FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 3 ft at 8 seconds. .SAT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 3 ft at 8 seconds. .SAT NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 3 ft at 8 seconds. .SUN...W winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms. .SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms. .MON...W winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms. .MON NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Showers with a chance of tstms. Winds and seas higher in and near tstms. $$