Station List

National Weather Service Marine Forecast FZUS52 KCHS

FZUS52 KCHS 180939
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
539 AM EDT Sat Apr 18 2026

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

AMZ300-182300
539 AM EDT Sat Apr 18 2026

.Synopsis for the coastal waters of south coastal South Carolina and north coastal Georgia... Atlantic high pressure will prevail through today. A strong cold front will push across the waters Sunday afternoon and evening bringing a period of hazardous winds and seas. Improving conditions arrive Monday as high pressure quickly returns.

AMZ340-182300
Charleston Harbor
539 AM EDT Sat Apr 18 2026

TODAY
S winds 5 kt, increasing to 10 kt this afternoon.

TONIGHT
S winds 10 kt.

SUN
SW winds 10 kt, becoming NW with gusts to 20 kt in the afternoon. A slight chance of showers in the afternoon.

SUN NIGHT
N winds 10 to 15 kt. A slight chance of showers in the evening.

MON
NE winds 5 to 10 kt.

MON NIGHT
S winds 5 kt, becoming NW after midnight.

TUE
NE winds 10 kt.

TUE NIGHT
SE winds 5 to 10 kt.

WED
S winds 5 to 10 kt.

WED NIGHT
SW winds 5 to 10 kt.

AMZ360-182300
Coastal waters from South Santee River to Edisto Beach SC out 20 NM
539 AM EDT Sat Apr 18 2026

TODAY
SW winds 5 to 10 kt, becoming S 10 to 15 kt late. Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and SE 2 ft at 8 seconds.

TONIGHT
S winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 2 ft at 8 seconds.

SUN
SW winds 10 to 15 kt, becoming NW 15 to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds and E 2 ft at 8 seconds. A slight chance of showers in the afternoon.

SUN NIGHT
N 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: E 4 ft at 8 seconds and NW 3 ft at 5 seconds, becoming NE 4 ft at 5 seconds and SW 1 foot at 5 seconds. A slight chance of showers.

MON
NE winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 4 to 5 ft. Wave Detail: NE 5 ft at 7 seconds.

MON NIGHT
SE winds 5 to 10 kt, becoming NW 10 to 15 kt after midnight. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds.

TUE
NE winds 15 to 20 kt. Seas 3 to 4 ft.

TUE NIGHT
SE winds 5 to 10 kt. Seas 2 to 3 ft.

WED
S winds 10 to 15 kt. Seas 2 to 3 ft.

WED NIGHT
SW winds 15 to 20 kt. Seas 2 to 3 ft.

AMZ362-182300
Coastal waters from Edisto Beach SC to Savannah GA out 20 NM
539 AM EDT Sat Apr 18 2026

TODAY
S winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds.

TONIGHT
S winds 10 to 15 kt with gusts to 20 kt. Seas 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 3 ft at 8 seconds.

SUN
SW winds 10 to 15 kt, becoming W in the afternoon. Seas 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 3 ft at 8 seconds. A slight chance of showers in the afternoon.

SUN NIGHT
N winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and N 3 ft at 3 seconds. A slight chance of showers in the evening.

MON
NE winds 15 to 20 kt, becoming E 10 to 15 kt in the afternoon. Seas 4 to 5 ft. Wave Detail: NE 5 ft at 6 seconds.

MON NIGHT
SE winds 5 to 10 kt, becoming W 10 to 15 kt after midnight. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds.

TUE
NE winds 10 to 15 kt. Seas 3 to 4 ft.

TUE NIGHT
SE winds 5 to 10 kt. Seas 2 to 3 ft.

WED
S winds 5 to 10 kt. Seas 2 to 3 ft.

WED NIGHT
S winds 10 to 15 kt. Seas 2 to 3 ft.

AMZ364-182300
Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary
539 AM EDT Sat Apr 18 2026

TODAY
SW winds 5 to 10 kt, becoming S 10 to 15 kt late. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds.

TONIGHT
S winds 10 to 15 kt. Seas 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 8 seconds.

SUN
W winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S 2 ft at 5 seconds. A slight chance of showers in the afternoon.

SUN NIGHT
N winds 15 to 20 kt, becoming NE 20 to 25 kt after midnight. Seas 3 to 4 ft, building to 4 to 5 ft after midnight. Wave Detail: E 4 ft at 8 seconds and NW 2 ft at 3 seconds, becoming NE 5 ft at 5 seconds. A slight chance of showers in the evening.

MON
NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Seas 4 to 5 ft. Wave Detail: NE 5 ft at 6 seconds.

MON NIGHT
SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds.

TUE
NE winds 10 to 15 kt. Seas 3 to 4 ft.

TUE NIGHT
SE winds 5 to 10 kt. Seas 3 to 4 ft.

WED
SE winds 5 to 10 kt. Seas 2 to 3 ft.

WED NIGHT
S winds 10 to 15 kt. Seas 2 to 3 ft.

AMZ380-182300
Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM
539 AM EDT Sat Apr 18 2026

TODAY
SW winds 10 kt. Seas 3 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at 8 seconds.

TONIGHT
S winds 10 to 15 kt, becoming SW 15 to 20 kt after midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 2 ft at 8 seconds.

SUN
SW winds 15 to 20 kt, becoming W in the afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 2 ft at 8 seconds. A slight chance of showers in the afternoon.

SUN NIGHT
N winds 20 to 25 kt with gusts to 30 kt. Seas 4 to 6 ft, building to 6 to 8 ft after midnight. Wave Detail: NW 5 ft at 5 seconds and E 5 ft at 8 seconds, becoming NE 7 ft at 6 seconds. A slight chance of tstms in the evening. A chance of showers.

MON
NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the afternoon. Wave Detail: NE 8 ft at 8 seconds, becoming NE 7 ft at 8 seconds.

MON NIGHT
E winds 5 to 10 kt, becoming N 10 to 15 kt after midnight. Seas 4 to 5 ft. Wave Detail: E 5 ft at 8 seconds.

TUE
NE winds 15 to 20 kt. Seas 4 to 5 ft.

TUE NIGHT
E winds 5 to 10 kt. Seas 3 to 4 ft.

WED
S winds 5 to 10 kt. Seas 3 ft.

WED NIGHT
SW winds 15 to 20 kt. Seas 3 ft.

Winds and seas higher in and near tstms.

AMZ382-182300
Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM
539 AM EDT Sat Apr 18 2026

TODAY
SW winds 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds.

TONIGHT
S winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 8 seconds.

SUN
SW winds 15 kt, becoming W in the afternoon. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 3 ft at 8 seconds. A slight chance of showers in the afternoon.

SUN NIGHT
N winds 20 to 25 kt with gusts to 35 kt. Seas 4 to 6 ft, building to 5 to 7 ft after midnight. Wave Detail: E 5 ft at 8 seconds and NW 4 ft at 4 seconds, becoming NE 7 ft at 6 seconds. A slight chance of showers.

MON
NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Seas 6 to 8 ft. Wave Detail: NE 8 ft at 7 seconds.

MON NIGHT
E winds 5 to 10 kt, becoming N 10 to 15 kt after midnight. Seas 4 to 6 ft, subsiding to 4 to 5 ft after midnight. Wave Detail: NE 6 ft at 8 seconds, becoming NE 5 ft at 8 seconds.

TUE
NE winds 15 to 20 kt. Seas 4 to 5 ft.

TUE NIGHT
E winds 5 to 10 kt. Seas 3 to 4 ft.

WED
SE winds 5 to 10 kt. Seas 3 ft.

WED NIGHT
S winds 10 to 15 kt. Seas 3 ft.

AMZ384-182300
Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM
539 AM EDT Sat Apr 18 2026

TODAY
SW winds 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at 8 seconds.

TONIGHT
S winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 8 seconds.

SUN
W winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 3 ft at 8 seconds.

SUN NIGHT
N winds 20 to 25 kt with gusts to 30 kt. Seas 4 to 5 ft, building to 5 to 7 ft after midnight. Wave Detail: SE 5 ft at 8 seconds and NW 3 ft at 4 seconds, becoming N 7 ft at 6 seconds. A slight chance of showers.

MON
NE winds 20 to 25 kt with gusts to 30 kt. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the afternoon. Wave Detail: NE 7 ft at 7 seconds, becoming NE 7 ft at 8 seconds.

MON NIGHT
NE winds 5 to 10 kt. Seas 4 to 6 ft, subsiding to 4 to 5 ft after midnight. Wave Detail: NE 6 ft at 8 seconds, becoming NE 5 ft at 8 seconds.

TUE
NE winds 10 to 15 kt. Seas 4 to 5 ft.

TUE NIGHT
E winds 5 to 10 kt. Seas 3 to 4 ft.

WED
SE winds 5 to 10 kt. Seas 3 ft.

WED NIGHT
S winds 10 to 15 kt. Seas 3 ft.