National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Coastal Waters Forecast
Issued by NWS Charleston, SC

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FZUS52 KCHS 200445
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
1245 AM EDT Sun Apr 20 2025

South Santee River SC to Savannah GA out 20 NM and Savannah GA to
Altamaha Sound GA out 60 NM, including Charleston Harbor and
Grays Reef National Marine Sanctuary

AMZ300-201715-
1245 AM EDT Sun Apr 20 2025

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
High pressure will linger across the region through Tuesday. A
front will approach the region by midweek then become stationary
over or near the area through late week.

$$

AMZ330-201715-
Charleston Harbor-
1245 AM EDT Sun Apr 20 2025

.REST OF TONIGHT...S winds 5 kt.
.SUN...S winds 5 to 10 kt.
.SUN NIGHT...S winds 5 kt.
.MON...S winds 5 kt, increasing to 5 to 10 kt in the afternoon.
.MON NIGHT...S winds 5 to 10 kt.
.TUE...S winds 5 to 10 kt.
.TUE NIGHT...S winds 5 to 10 kt.
.WED...S winds 5 to 10 kt. A slight chance of showers and tstms.
.WED NIGHT...S winds 5 kt. A slight chance of showers and tstms.
.THU...SE winds 5 to 10 kt. A slight chance of showers and tstms.
.THU NIGHT...SE winds 5 kt.

Winds and waves higher in and near tstms.

Unless otherwise noted, waves 1 foot or less.

Charleston Harbor water temperature 70 degrees.

$$

AMZ350-201715-
Waters from South Santee River to Edisto Beach SC out 20 NM-
1245 AM EDT Sun Apr 20 2025

.REST OF TONIGHT...S winds 5 kt. Seas 3 ft. Wave Detail: SE 3 ft
at 7 seconds.
.SUN...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 7 seconds.
.SUN NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 7 seconds.
.MON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds.
.MON NIGHT...S winds 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds.
.TUE...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds.
.TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft.
.WED...S winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.WED NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance
of showers and tstms.
.THU...SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers
and tstms.
.THU NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

$$

AMZ352-201715-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
1245 AM EDT Sun Apr 20 2025

.REST OF TONIGHT...S winds 5 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 7 seconds.
.SUN...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 7 seconds.
.SUN NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 7 seconds.
.MON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds.
.MON NIGHT...S winds 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds.
.TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds.
.TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft.
.WED...S winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.WED NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft.
.THU...SE winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.THU NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

$$

AMZ354-201715-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
1245 AM EDT Sun Apr 20 2025

.REST OF TONIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SE 3 ft at 7 seconds.
.SUN...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 7 seconds.
.SUN NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 7 seconds.
.MON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds and E 1 foot at 7 seconds.
.MON NIGHT...S winds 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds.
.TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds.
.TUE NIGHT...S winds 10 kt. Seas 2 to 3 ft.
.WED...S winds 5 to 10 kt. Seas 2 to 3 ft.
.WED NIGHT...S winds 10 kt. Seas 2 to 3 ft.
.THU...SE winds 5 to 10 kt. Seas 2 to 3 ft.
.THU NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft.

$$

AMZ374-201715-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
1245 AM EDT Sun Apr 20 2025

.REST OF TONIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: E 3 ft at 7 seconds.
.SUN...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft
at 7 seconds.
.SUN 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 7 seconds.
.MON...S winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 8 seconds and E 1 foot at 7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft
at 8 seconds and E 1 foot at 7 seconds.
.TUE...S winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at
8 seconds and E 1 foot at 8 seconds.
.TUE NIGHT...S winds 5 to 10 kt. Seas 3 to 4 ft.
.WED...S winds 5 to 10 kt. Seas 3 ft.
.WED NIGHT...SE winds 5 to 10 kt. Seas 3 ft.
.THU...SE winds 5 to 10 kt. Seas 2 to 3 ft.
.THU NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft.

$$