National Weather Service Marine Forecast FZUS52 KCHS

FZUS52 KCHS 220915
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
515 AM EDT Thu Oct 22 2026

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

AMZ300-222315
515 AM EDT Thu Oct 22 2026

.Synopsis for the coastal waters of south coastal South Carolina and north coastal Georgia... Strong high pressure will extend across the waters through early next week. An extended period of dangerous marine conditions is becoming increasingly likely beginning Friday and continuing through the weekend with near gale-force winds and hazardous seas.

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AMZ340-222315
Charleston Harbor
515 AM EDT Thu Oct 22 2026

TODAY
NW winds 5 kt, becoming NE.

TONIGHT
NE winds 5 to 10 kt.

FRI
NE winds 10 to 15 kt.

FRI NIGHT
NE winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Waves 1 to 2 ft.

SAT
NE winds 15 to 20 kt with gusts to 25 kt, increasing to 20 to 25 kt with gusts to 30 kt in the afternoon. Waves 2 to 3 ft.

SAT NIGHT
NE winds 20 to 25 kt with gusts to 30 kt. Waves 2 to 2 ft.

SUN
NE winds 20 to 25 kt with gusts to 30 kt. Waves 2 to 3 ft.

SUN NIGHT
NE winds 20 to 25 kt with gusts to 30 kt. Waves 2 to 3 ft.

MON
NE winds 15 kt.

MON NIGHT
NE winds 10 to 15 kt.

Unless otherwise noted, waves 1 foot or less.

Charleston Harbor water temperature 70 degrees.

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AMZ360-222315
Coastal waters from South Santee River to Edisto Beach SC out 20 NM
515 AM EDT Thu Oct 22 2026

TODAY
N winds 10 to 15 kt, becoming NE 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 12 seconds.

TONIGHT
NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 12 seconds.

FRI
NE winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft, building to 4 to 5 ft in the afternoon. Wave Detail: NE 4 ft at 5 seconds and E 4 ft at 12 seconds, becoming NE 4 ft at 5 seconds and E 2 ft at 12 seconds.

FRI NIGHT
NE winds 20 to 25 kt with gusts to 30 kt, increasing to 25 to 30 kt with gusts to 35 kt. Seas 4 to 6 ft, building to 6 to 8 ft after midnight. Wave Detail: NE 5 ft at 5 seconds and E 2 ft at 11 seconds, becoming E 7 ft at 7 seconds and E 2 ft at 11 seconds.

SAT
NE winds 25 to 30 kt with gusts to 40 kt. Seas 7 to 9 ft. Wave Detail: NE 9 ft at 7 seconds and E 1 foot at 11 seconds. A slight chance of showers.

SAT NIGHT
NE winds 25 to 30 kt with gusts to 40 kt. Seas 8 to 10 ft. Wave Detail: E 10 ft at 8 seconds.

SUN
NE winds 25 to 30 kt with gusts to 40 kt. Seas 8 to 10 ft. A slight chance of showers.

SUN NIGHT
NE winds 25 to 30 kt. Seas 9 to 11 ft.

MON
NE winds 20 to 25 kt. Seas 8 to 10 ft.

MON NIGHT
NE winds 20 to 25 kt. Seas 6 to 8 ft.

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AMZ362-222315
Coastal waters from Edisto Beach SC to Savannah GA out 20 NM
515 AM EDT Thu Oct 22 2026

TODAY
N winds 10 to 15 kt, becoming NE 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 11 seconds.

TONIGHT
NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 12 seconds.

FRI
NE winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft, building to 4 to 5 ft in the afternoon. Wave Detail: NE 4 ft at 5 seconds and E 4 ft at 12 seconds, becoming NE 5 ft at 6 seconds and E 2 ft at 12 seconds.

FRI NIGHT
NE winds 20 to 25 kt with gusts to 30 kt, increasing to 25 to 30 kt with gusts to 35 kt after midnight. Seas 4 to 6 ft, building to 5 to 7 ft after midnight. Wave Detail: NE 5 ft at 6 seconds and E 2 ft at 12 seconds, becoming E 7 ft at 7 seconds and E 1 foot at 11 seconds.

SAT
NE winds 25 to 30 kt with gusts to 40 kt. Seas 6 to 8 ft, building to 7 to 9 ft in the afternoon. Wave Detail: NE 8 ft at 7 seconds and E 1 foot at 11 seconds, becoming NE 9 ft at 7 seconds. A slight chance of showers.

SAT NIGHT
NE winds 25 to 30 kt with gusts to 40 kt. Seas 9 to 11 ft. Wave Detail: E 11 ft at 8 seconds.

SUN
NE winds 25 to 30 kt with gusts to 40 kt. Seas 8 to 10 ft. A slight chance of showers.

SUN NIGHT
NE winds 25 to 30 kt. Seas 9 to 11 ft.

MON
NE winds 20 to 25 kt. Seas 8 to 10 ft.

MON NIGHT
NE winds 20 to 25 kt. Seas 7 to 9 ft.

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AMZ364-222315
Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary
515 AM EDT Thu Oct 22 2026

TODAY
N winds 10 to 15 kt, becoming NE 5 to 10 kt late. Seas 2 to 4 ft. Wave Detail: NE 4 ft at 11 seconds, becoming NE 3 ft at 12 seconds.

TONIGHT
NE winds 5 to 10 kt, increasing to 10 to 15 kt after midnight. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 12 seconds.

FRI
NE winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Seas 3 to 4 ft, building to 4 to 6 ft in the afternoon. Wave Detail: NE 4 ft at 5 seconds and NE 4 ft at 12 seconds, becoming NE 5 ft at 6 seconds and NE 3 ft at 12 seconds.

FRI NIGHT
NE winds 20 to 25 kt, increasing to 25 to 30 kt with gusts to 35 kt after midnight. Seas 5 to 7 ft, building to 6 to 8 ft after midnight. Wave Detail: NE 6 ft at 6 seconds and NE 2 ft at 12 seconds, becoming NE 8 ft at 7 seconds and NE 2 ft at 12 seconds.

SAT
NE winds 30 kt with gusts to 40 kt. Seas 7 to 9 ft, building to 8 to 10 ft in the afternoon. Wave Detail: NE 9 ft at 7 seconds and NE 2 ft at 11 seconds, becoming NE 10 ft at 8 seconds and NE 1 foot at 11 seconds. A slight chance of showers in the morning, then a chance of showers in the afternoon.

SAT NIGHT
NE winds 30 to 35 kt with gusts to 40 kt. Seas 9 to 12 ft. Wave Detail: NE 12 ft at 8 seconds. A chance of showers in the evening.

SUN
NE winds 25 to 30 kt with gusts to 40 kt. Seas 9 to 11 ft. A slight chance of showers.

SUN NIGHT
NE winds 25 to 35 kt. Seas 9 to 12 ft. A slight chance of showers.

MON
NE winds 25 to 30 kt. Seas 9 to 11 ft.

MON NIGHT
NE winds 25 to 30 kt. Seas 8 to 10 ft.

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AMZ380-222315
Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM
515 AM EDT Thu Oct 22 2026

TODAY
N winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: NE 6 ft at 12 seconds.

TONIGHT
NE winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft. Wave Detail: NE 5 ft at 12 seconds.

FRI
NE winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 6 ft. Wave Detail: NE 5 ft at 12 seconds, becoming NE 5 ft at 5 seconds and NE 5 ft at 11 seconds.

FRI NIGHT
NE winds 25 to 30 kt with gusts to 35 kt. Seas 6 to 8 ft, building to 8 to 10 ft after midnight. Wave Detail: NE 8 ft at 6 seconds and E 3 ft at 11 seconds, becoming NE 10 ft at 7 seconds and E 2 ft at 11 seconds. A chance of showers in the evening, then showers likely with a slight chance of tstms after midnight.

SAT
NE winds 25 to 30 kt with gusts to 40 kt. Seas 9 to 11 ft, building to 10 to 12 ft in the afternoon. Wave Detail: NE 10 ft at 8 seconds, becoming NE 11 ft at 8 seconds. Showers with a slight chance of tstms in the morning, then showers likely in the afternoon.

SAT NIGHT
NE winds 25 to 30 kt with gusts to 40 kt. Seas 11 to 12 ft, subsiding to 10 to 12 ft after midnight. Wave Detail: NE 12 ft at 9 seconds, becoming NE 12 ft at 8 seconds. A chance of showers.

SUN
NE winds 25 to 30 kt with gusts to 40 kt. Seas 10 to 13 ft. Showers.

SUN NIGHT
NE winds 25 to 30 kt. Seas 11 to 13 ft. A chance of showers.

MON
NE winds 20 to 25 kt. Seas 9 to 12 ft. A slight chance of showers.

MON NIGHT
NE winds 20 to 25 kt. Seas 8 to 10 ft. A slight chance of showers.

Winds and seas higher in and near tstms.

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AMZ382-222315
Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM
515 AM EDT Thu Oct 22 2026

TODAY
NE winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft. Wave Detail: NE 5 ft at 12 seconds.

TONIGHT
NE winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft. Wave Detail: NE 5 ft at 12 seconds.

FRI
NE winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Seas 4 to 6 ft. Wave Detail: NE 5 ft at 12 seconds and NE 4 ft at 5 seconds, becoming NE 5 ft at 6 seconds and NE 3 ft at 12 seconds.

FRI NIGHT
NE winds 25 to 30 kt with gusts to 40 kt. Seas 6 to 8 ft, building to 8 to 10 ft after midnight. Wave Detail: NE 8 ft at 6 seconds and NE 3 ft at 11 seconds, becoming NE 10 ft at 7 seconds and NE 2 ft at 11 seconds. A chance of showers in the evening, then showers likely with a slight chance of tstms after midnight.

SAT
NE winds 30 kt with gusts to 40 kt. Seas 9 to 11 ft, building to 9 to 13 ft in the afternoon. Wave Detail: NE 11 ft at 8 seconds, becoming NE 12 ft at 8 seconds. Showers with a slight chance of tstms.

SAT NIGHT
NE winds 30 kt with gusts to 40 kt. Seas 11 to 14 ft. Wave Detail: NE 14 ft at 9 seconds. A chance of showers.

SUN
NE winds 25 to 30 kt with gusts to 40 kt. Seas 10 to 13 ft. Showers likely.

SUN NIGHT
NE winds 25 to 35 kt. Seas 11 to 14 ft. A chance of showers.

MON
NE winds 25 kt. Seas 10 to 13 ft. A slight chance of showers.

MON NIGHT
NE winds 20 to 25 kt. Seas 9 to 11 ft. A slight chance of showers.

Winds and seas higher in and near tstms.

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AMZ384-222315
Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM
515 AM EDT Thu Oct 22 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE MONDAY NIGHT

TODAY
NE winds 10 to 15 kt. Seas 4 to 6 ft. Wave Detail: NE 6 ft at 12 seconds.

TONIGHT
NE winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 6 ft. Wave Detail: NE 5 ft at 12 seconds.

FRI
NE winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Seas 4 to 6 ft, building to 5 to 7 ft in the afternoon. Wave Detail: E 5 ft at 12 seconds and NE 4 ft at 5 seconds, becoming NE 6 ft at 6 seconds and E 4 ft at 12 seconds.

FRI NIGHT
NE winds 20 to 25 kt, increasing to 25 to 30 kt with gusts to 35 kt after midnight. Seas 7 to 9 ft, building to 8 to 10 ft after midnight. Wave Detail: NE 8 ft at 6 seconds and NE 3 ft at 12 seconds, becoming NE 10 ft at 7 seconds and NE 3 ft at 12 seconds. A chance of showers in the evening, then showers after midnight.

SAT
NE winds 30 kt with gusts to 40 kt. Seas 9 to 11 ft, building to 10 to 13 ft in the afternoon. Wave Detail: NE 11 ft at 8 seconds and NE 1 foot at 11 seconds, becoming NE 12 ft at 8 seconds. Showers. A slight chance of tstms in the afternoon.

SAT NIGHT
NE winds 30 to 35 kt with gusts to 40 kt. Seas 11 to 14 ft, building to 12 to 15 ft after midnight. Wave Detail: NE 14 ft at 9 seconds. A chance of showers with a slight chance of tstms in the evening, then a slight chance of showers after midnight.

SUN
NE winds 30 to 35 kt with gusts to 40 kt. Seas 11 to 14 ft. A chance of showers.

SUN NIGHT
NE winds 25 to 35 kt. Seas 12 to 15 ft. A chance of showers.

MON
NE winds 25 kt. Seas 11 to 14 ft. A slight chance of showers.

MON NIGHT
NE winds 25 to 30 kt. Seas 9 to 13 ft. A slight chance of showers.

Winds and seas higher in and near tstms.