National Weather Service Marine Forecast FZUS52 KCHS

FZUS52 KCHS 162109
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
509 PM EDT Wed Sep 16 2026

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

AMZ300-171115
509 PM EDT Wed Sep 16 2026

.Synopsis for the coastal waters of south coastal South Carolina and north coastal Georgia... High pressure will linger over the region this week before eroding this weekend as a trough of low pressure approaches from the Atlantic.

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AMZ340-171115
Charleston Harbor
509 PM EDT Wed Sep 16 2026

TONIGHT
NE winds 10 to 15 kt, diminishing to 5 to 10 kt.

THU
NE winds 5 to 10 kt, becoming E in the afternoon.

THU NIGHT
E winds 5 to 10 kt, diminishing to 5 kt after midnight.

FRI
N winds 5 kt, becoming SE in the afternoon.

FRI NIGHT
S winds 5 to 10 kt, becoming SW after midnight.

SAT
N winds 5 kt, becoming E in the afternoon. A chance of showers and tstms in the afternoon.

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

SUN
E winds 5 to 10 kt. A chance of showers and tstms.

SUN NIGHT
SE winds 5 kt. A slight chance of showers and tstms.

MON
E winds 5 to 10 kt. A chance of showers and tstms.

MON NIGHT
E winds 5 kt. A chance of showers and tstms.

Winds and waves higher in and near tstms.

Unless otherwise noted, waves 1 foot or less.

Charleston Harbor water temperature 84 degrees.

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AMZ360-171115
Coastal waters from South Santee River to Edisto Beach SC out 20 NM
509 PM EDT Wed Sep 16 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING

TONIGHT
NE winds 15 to 20 kt with gusts to 25 kt, diminishing to 10 to 15 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft. Wave Detail: E 4 ft at 6 seconds, becoming E 4 ft at 7 seconds.

THU
NE winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 7 seconds.

THU NIGHT
E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and E 1 foot at 13 seconds.

FRI
N winds 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and E 1 foot at 13 seconds.

FRI NIGHT
S winds 5 to 10 kt, diminishing to 5 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 2 ft at 7 seconds and E 1 foot at 12 seconds.

SAT
N winds 5 kt, becoming E in the afternoon. Seas 2 ft. Wave Detail: E 2 ft at 7 seconds and E 1 foot at 12 seconds. A slight chance of showers and tstms in the afternoon.

SAT NIGHT
E winds 5 to 10 kt. Seas 2 ft. A slight chance of tstms. A slight chance of showers in the evening, then a chance of showers after midnight.

SUN
E winds 5 to 10 kt. Seas 2 ft. A chance of showers with a slight chance of tstms.

SUN NIGHT
SE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.

MON
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.

MON NIGHT
E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms.

Winds and seas higher in and near tstms.

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AMZ362-171115
Coastal waters from Edisto Beach SC to Savannah GA out 20 NM
509 PM EDT Wed Sep 16 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING

TONIGHT
NE winds 15 to 20 kt with gusts to 25 kt, diminishing to 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft. Wave Detail: E 5 ft at 6 seconds, becoming E 4 ft at 6 seconds.

THU
NE winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 7 seconds and SE 2 ft at 8 seconds.

THU NIGHT
E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at 7 seconds and SE 2 ft at 8 seconds.

FRI
NE winds 5 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 7 seconds and SE 1 foot at 13 seconds.

FRI NIGHT
S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 7 seconds and E 1 foot at 12 seconds.

SAT
NE winds 5 kt, becoming E in the afternoon. Seas 2 ft. Wave Detail: E 2 ft at 7 seconds and SE 1 foot at 12 seconds.

SAT NIGHT
E winds 5 to 10 kt. Seas 2 ft. A slight chance of tstms. A slight chance of showers in the evening, then a chance of showers after midnight.

SUN
E winds 5 to 10 kt. Seas 2 ft. A chance of showers with a slight chance of tstms.

SUN NIGHT
SE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.

MON
E winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.

MON NIGHT
E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms.

Winds and seas higher in and near tstms.

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AMZ364-171115
Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary
509 PM EDT Wed Sep 16 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT THURSDAY

TONIGHT
NE winds 15 to 20 kt. Gusts to 25 kt through early morning. Seas 4 to 6 ft, subsiding to 4 to 5 ft late. Wave Detail: E 5 ft at 6 seconds.

THU
NE winds 15 to 20 kt. Seas 4 ft. Wave Detail: E 4 ft at 7 seconds.

THU NIGHT
E winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 3 to 4 ft. Wave Detail: E 4 ft at 7 seconds and SE 2 ft at 8 seconds.

FRI
NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and SE 2 ft at 8 seconds.

FRI NIGHT
SE winds 5 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 7 seconds.

SAT
NE winds 5 kt, becoming E in the afternoon. Seas 2 ft. Wave Detail: E 2 ft at 7 seconds.

SAT NIGHT
E winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms in the evening, then a chance of showers and tstms after midnight.

SUN
E winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.

SUN NIGHT
E winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.

MON
E winds 5 to 10 kt. Seas 2 ft. Showers likely with a chance of tstms.

MON NIGHT
E winds 5 to 10 kt. Seas 2 ft. Showers likely with a chance of tstms.

Winds and seas higher in and near tstms.

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AMZ380-171115
Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM
509 PM EDT Wed Sep 16 2026

TONIGHT
NE winds 15 to 20 kt with gusts to 25 kt, diminishing to 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft. Wave Detail: NE 5 ft at 7 seconds.

THU
NE winds 10 to 15 kt with gusts to 20 kt. Seas 4 ft. Wave Detail: E 4 ft at 7 seconds and E 1 foot at 13 seconds.

THU NIGHT
E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 7 seconds and E 1 foot at 13 seconds.

FRI
NE winds 5 kt. Seas 3 ft. Wave Detail: E 3 ft at 7 seconds and E 1 foot at 12 seconds.

FRI NIGHT
SE winds 5 to 10 kt, diminishing to 5 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and E 1 foot at 12 seconds.

SAT
NE winds 5 kt, becoming E in the afternoon. Seas 2 ft. Wave Detail: E 2 ft at 7 seconds and SE 2 ft at 12 seconds. A slight chance of showers and tstms.

SAT NIGHT
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. A slight chance of tstms in the evening, then a chance of tstms after midnight.

SUN
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers with a slight chance of tstms.

SUN NIGHT
SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.

MON
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.

MON NIGHT
E winds 5 to 10 kt. Seas 3 ft. Showers likely with a chance of tstms.

Winds and seas higher in and near tstms.

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AMZ382-171115
Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM
509 PM EDT Wed Sep 16 2026

TONIGHT
NE winds 15 to 20 kt. Gusts to 25 kt through early morning. Seas 4 to 5 ft. Wave Detail: NE 5 ft at 7 seconds and SE 2 ft at 8 seconds.

THU
NE winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft. Wave Detail: NE 4 ft at 7 seconds and SE 2 ft at 8 seconds.

THU NIGHT
NE winds 10 to 15 kt, becoming E 5 to 10 kt after midnight. Seas 3 to 4 ft. Wave Detail: NE 4 ft at 7 seconds and SE 2 ft at 8 seconds.

FRI
NE winds 5 to 10 kt. Seas 3 ft. Wave Detail: E 3 ft at 7 seconds and SE 2 ft at 8 seconds.

FRI NIGHT
SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 7 seconds and E 1 foot at 12 seconds.

SAT
E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 7 seconds and SE 1 foot at 12 seconds. A slight chance of showers in the afternoon.

SAT NIGHT
E winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms in the evening, then a chance of showers and tstms after midnight.

SUN
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.

SUN NIGHT
SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.

MON
E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms.

MON NIGHT
E winds 5 to 10 kt. Seas 3 ft. Showers likely with a chance of tstms.

Winds and seas higher in and near tstms.

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AMZ384-171115
Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM
509 PM EDT Wed Sep 16 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT THURSDAY

TONIGHT
NE winds 15 to 20 kt. Gusts to 25 kt through early morning. Seas 4 to 6 ft. Wave Detail: NE 6 ft at 7 seconds, becoming NE 5 ft at 7 seconds.

THU
NE winds 15 kt with gusts to 20 kt. Seas 4 to 5 ft. Wave Detail: NE 5 ft at 7 seconds.

THU NIGHT
NE winds 10 to 15 kt, becoming E 5 to 10 kt after midnight. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight. Wave Detail: E 5 ft at 8 seconds, becoming E 4 ft at 8 seconds.

FRI
NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and SE 1 foot at 12 seconds.

FRI NIGHT
E winds 5 kt. Seas 3 ft. Wave Detail: E 3 ft at 7 seconds and SE 1 foot at 12 seconds.

SAT
E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 7 seconds and SE 1 foot at 12 seconds. A slight chance of showers and tstms in the afternoon.

SAT NIGHT
E winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms in the evening, then a chance of showers and tstms after midnight.

SUN
E winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.

SUN NIGHT
E winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.

MON
E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms.

MON NIGHT
E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms.

Winds and seas higher in and near tstms.