National Weather Service Marine Forecast FZUS52 KCHS

FZUS52 KCHS 120802
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
402 AM EDT Mon May 12 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

AMZ300-122030
402 AM EDT Mon May 12 2025

.Synopsis for the coastal waters of south coastal South Carolina and north coastal Georgia... A front will remain stalled near the area, before lifting north of the region by midweek. High pressure is expected to return late week.

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AMZ330-122030
Charleston Harbor
402 AM EDT Mon May 12 2025

TODAY
SE winds 10 kt, increasing to 15 kt late. Showers with a chance of tstms.

TONIGHT
SE winds 10 to 15 kt with gusts to 20 kt. Showers with a chance of tstms.

TUE
S winds 10 kt. Showers likely with a chance of tstms in the morning, then a chance of showers with a slight chance of tstms in the afternoon.

TUE NIGHT
SW winds 5 to 10 kt. A chance of showers and tstms.

WED
SW winds 5 kt, increasing to 10 to 15 kt in the afternoon. A chance of showers. A slight chance of tstms in the morning, then a chance of tstms in the afternoon.

WED NIGHT
SW winds 5 to 10 kt. A chance of showers and tstms, mainly in the evening.

THU
SW winds 10 to 15 kt.

THU NIGHT
SW winds 10 to 15 kt.

FRI
SW winds 10 to 15 kt.

FRI NIGHT
SW winds 10 to 15 kt.

Winds and waves higher in and near tstms.

Unless otherwise noted, waves 1 foot or less.

Charleston Harbor water temperature 75 degrees.

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AMZ350-122030
Waters from South Santee River to Edisto Beach SC out 20 NM
402 AM EDT Mon May 12 2025

SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON

TODAY
SE winds 10 to 15 kt, increasing to 15 to 20 kt with gusts to 25 kt late. Seas 4 to 6 ft. Wave Detail: SE 4 ft at 7 seconds. Showers with a chance of tstms.

TONIGHT
SE winds 15 to 20 kt with gusts to 25 kt. Seas 5 to 6 ft. Wave Detail: SE 6 ft at 8 seconds. Showers with a chance of tstms.

TUE
S winds 10 to 15 kt. Seas 5 to 6 ft, subsiding to 4 to 5 ft in the afternoon. Wave Detail: SE 6 ft at 8 seconds, becoming SE 5 ft at 8 seconds. Showers likely with a chance of tstms in the morning, then a chance of showers with a slight chance of tstms in the afternoon.

TUE NIGHT
SW winds 10 to 15 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight. Wave Detail: SE 5 ft at 8 seconds, becoming SE 4 ft at 8 seconds. A chance of showers with a slight chance of tstms in the evening, then showers likely with a chance of tstms after midnight.

WED
SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 7 seconds. Showers likely with a slight chance of tstms in the morning, then a chance of showers and tstms in the afternoon.

WED NIGHT
SW winds 10 to 15 kt. Seas 3 ft. Wave Detail: SE 3 ft at 7 seconds. A chance of showers. A chance of tstms, mainly in the evening.

THU
SW winds 10 to 15 kt. Seas 2 to 3 ft.

THU NIGHT
SW winds 10 to 15 kt. Seas 3 ft.

FRI
SW winds 10 to 15 kt. Seas 2 to 3 ft.

FRI NIGHT
SW winds 10 to 15 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

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AMZ352-122030
Waters from Edisto Beach SC to Savannah GA out 20 NM
402 AM EDT Mon May 12 2025

SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH TUESDAY MORNING

TODAY
SE winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft, building to 4 to 6 ft this afternoon. Wave Detail: SE 4 ft at 7 seconds, becoming SE 5 ft at 8 seconds. A chance of tstms. Showers.

TONIGHT
S winds 15 to 20 kt with gusts to 25 kt. Seas 5 to 6 ft, subsiding to 4 to 6 ft after midnight. Wave Detail: SE 5 ft at 7 seconds, becoming SE 6 ft at 7 seconds. Showers with a chance of tstms.

TUE
SW winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: SE 5 ft at 8 seconds. Showers likely with a chance of tstms in the morning, then a chance of showers with a slight chance of tstms in the afternoon.

TUE NIGHT
SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. Showers likely with a chance of tstms.

WED
SW winds 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. A chance of showers. A chance of tstms in the afternoon.

WED NIGHT
SW winds 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and S 1 foot at 4 seconds. A chance of showers and tstms, mainly in the evening.

THU
SW winds 10 to 15 kt. Seas 2 to 3 ft.

THU NIGHT
SW winds 10 to 15 kt. Seas 2 to 3 ft.

FRI
SW winds 10 kt. Seas 2 to 3 ft.

FRI NIGHT
SW winds 10 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

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AMZ354-122030
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including Grays Reef National Marine Sanctuary
402 AM EDT Mon May 12 2025

SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH LATE TONIGHT

TODAY
SE winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft, building to 4 to 6 ft this afternoon. Wave Detail: SE 5 ft at 7 seconds. A chance of tstms. Showers.

TONIGHT
S winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 4 to 6 ft, subsiding to 4 to 5 ft after midnight. Wave Detail: SE 6 ft at 7 seconds, becoming SE 5 ft at 7 seconds. A chance of tstms. Showers, mainly in the evening.

TUE
SW winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: SE 5 ft at 8 seconds. A chance of showers. A chance of tstms, mainly in the morning.

TUE NIGHT
SW winds 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. A chance of showers. A chance of tstms, mainly in the evening.

WED
SW winds 10 kt, becoming S in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S 1 foot at 4 seconds. A slight chance of showers in the morning, then a chance of showers and tstms in the afternoon.

WED NIGHT
S winds 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S 2 ft at 4 seconds. A chance of showers and tstms in the evening, then a slight chance of showers after midnight.

THU
SW winds 10 kt. Seas 2 to 3 ft.

THU NIGHT
SW winds 10 kt. Seas 2 to 3 ft.

FRI
SW winds 10 kt. Seas 2 to 3 ft.

FRI NIGHT
SW winds 10 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

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AMZ374-122030
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM
402 AM EDT Mon May 12 2025

SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON

TODAY
SE winds 15 to 20 kt with gusts to 25 kt. Seas 5 to 6 ft, building to 5 to 7 ft this afternoon. Wave Detail: SE 5 ft at 7 seconds, becoming SE 6 ft at 7 seconds. A chance of tstms. Showers.

TONIGHT
S winds 15 to 20 kt with gusts to 25 kt. Seas 6 to 7 ft, subsiding to 5 to 7 ft after midnight. Wave Detail: SE 6 ft at 7 seconds, becoming SE 7 ft at 8 seconds. A chance of tstms. Showers.

TUE
SW winds 10 to 15 kt. Seas 4 to 6 ft, subsiding to 4 to 5 ft in the afternoon. Wave Detail: SE 6 ft at 8 seconds, becoming SE 5 ft at 8 seconds. A chance of showers. A chance of tstms, mainly in the morning.

TUE NIGHT
SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. A chance of showers and tstms.

WED
SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and SW 2 ft at 4 seconds. A chance of showers in the morning, then a slight chance of showers and tstms in the afternoon.

WED NIGHT
S winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and SW 2 ft at 4 seconds. A slight chance of showers and tstms.

THU
SW winds 10 kt. Seas 3 to 4 ft.

THU NIGHT
SW winds 10 kt. Seas 3 to 4 ft.

FRI
SW winds 10 kt. Seas 3 to 4 ft.

FRI NIGHT
SW winds 10 to 15 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.