917
FZUS52 KCHS 252052
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
452 PM EDT Thu Sep 25 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

AMZ300-260930-
452 PM EDT Thu Sep 25 2025

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
A weak front will approach the region late this week, likely
stalling just offshore through the weekend. Tropical low pressure
could approach the Southeast U.S. early next week.

$$

AMZ330-260930-
Charleston Harbor-
452 PM EDT Thu Sep 25 2025

.TONIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt late. A
slight chance of showers and tstms after midnight. A chance of
showers and tstms late.
.FRI...SW winds 5 to 10 kt. A slight chance of showers and tstms
in the morning, then a chance of showers and tstms in the
afternoon.
.FRI NIGHT...S winds 5 to 10 kt. Showers likely with a chance of
tstms.
.SAT...E winds 5 kt, becoming SE in the afternoon. Showers
likely. A chance of tstms in the morning, then tstms likely in
the afternoon.
.SAT NIGHT...SE winds 5 kt. A chance of tstms. Showers likely,
mainly in the evening.
.SUN...NE winds 5 to 10 kt. A chance of showers with a slight
chance of tstms in the morning, then showers likely with a chance
of tstms in the afternoon.
.SUN NIGHT...NE winds 10 kt. Showers likely with a chance of
tstms.
.MON...NE winds 15 to 20 kt. Waves 1 to 2 ft. A chance of showers
and tstms.
.MON NIGHT...N winds 15 to 20 kt. Waves 1 to 2 ft. A chance of
showers and tstms.
.TUE...W winds 15 to 20 kt. Waves 1 to 2 ft. A chance of showers
with a slight chance of tstms.
.TUE NIGHT...N winds 10 to 15 kt. A slight chance of showers.

Winds and waves higher in and near tstms.

Unless otherwise noted, waves 1 foot or less.

Charleston Harbor water temperature 81 degrees.

$$

AMZ350-260930-
Waters from South Santee River to Edisto Beach SC out 20 NM-
452 PM EDT Thu Sep 25 2025

.TONIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 to
4 ft. Wave Detail: S 3 ft at 4 seconds and E 2 ft at 10 seconds.
A slight chance of showers and tstms after midnight. A chance of
showers and tstms late.
.FRI...SW winds 5 to 10 kt. Seas 3 to 4 ft, subsiding to 2 to
3 ft in the afternoon. Wave Detail: S 3 ft at 5 seconds and E
2 ft at 9 seconds, becoming S 2 ft at 5 seconds and E 2 ft at
8 seconds. A chance of showers and tstms.
.FRI NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 5 seconds and E 2 ft at 8 seconds. Showers with a chance
of tstms. Vsby 1 to 3 NM after midnight.
.SAT...W winds 5 kt, becoming S in the afternoon. Seas 2 ft. Wave
Detail: E 2 ft at 9 seconds and S 1 foot at 4 seconds. A chance
of tstms. Showers.
.SAT NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
2 ft at 8 seconds and S 1 foot at 4 seconds. Showers likely with
a chance of tstms.
.SUN...NE winds 5 to 10 kt, becoming E 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds.
Showers likely with a chance of tstms.
.SUN NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely
with a chance of tstms.
.MON...NE winds 20 to 25 kt. Seas 5 to 7 ft. A chance of showers
and tstms.
.MON NIGHT...N winds 20 to 25 kt. Seas 8 to 10 ft. A chance of
showers and tstms.
.TUE...SW winds 20 to 25 kt. Seas 9 to 13 ft. A chance of showers
with a slight chance of tstms.
.TUE NIGHT...N winds 20 to 25 kt. Seas 7 to 9 ft. A chance of
showers with a slight chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ352-260930-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
452 PM EDT Thu Sep 25 2025

.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 E 2 ft at 10 seconds.
A slight chance of showers and tstms late this evening. A chance
of showers and tstms after midnight.
.FRI...SW winds 5 to 10 kt, becoming S in the afternoon. Seas
2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and E 2 ft at
9 seconds. A chance of showers and tstms.
.FRI NIGHT...S winds 5 to 10 kt. Seas 2 ft. Wave Detail: S 2 ft
at 4 seconds and E 2 ft at 10 seconds. Showers with a chance of
tstms.
.SAT...S winds 5 kt. Seas 2 ft. Wave Detail: E 2 ft at 9 seconds
and S 1 foot at 4 seconds. A chance of tstms. Showers.
.SAT NIGHT...SE winds 5 kt. Seas 2 ft. Wave Detail: S 2 ft at
5 seconds and SE 2 ft at 9 seconds. A chance of tstms. A chance
of showers in the evening, then showers likely after midnight.
.SUN...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds. Showers likely. A slight chance of tstms in the
morning, then a chance of tstms in the afternoon.
.SUN NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely
with a chance of tstms.
.MON...N winds 15 to 20 kt. Seas 4 to 6 ft. A chance of showers
and tstms.
.MON NIGHT...N winds 20 kt. Seas 6 to 8 ft. A chance of showers
with a slight chance of tstms.
.TUE...W winds 20 kt. Seas 8 to 10 ft. A chance of showers.
.TUE NIGHT...NW winds 15 to 20 kt. Seas 6 to 8 ft. A slight
chance of showers.

Winds and seas higher in and near tstms.

$$

AMZ354-260930-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
452 PM EDT Thu Sep 25 2025

.TONIGHT...S winds 10 to 15 kt, increasing to 15 kt with gusts to
20 kt, becoming SW late. Seas 3 to 4 ft. Wave Detail: S 3 ft at 4
seconds and E 2 ft at 11 seconds. A slight chance of showers and
tstms late this evening. A chance of showers and tstms after
midnight, then a slight chance of showers and tstms late.
.FRI...W winds 5 to 10 kt, becoming S in the afternoon. Seas 2 to
3 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at 10 seconds.
A chance of showers and tstms in the afternoon.
.FRI NIGHT...S winds 5 to 10 kt. Seas 2 ft. Wave Detail: S 2 ft
at 4 seconds and E 2 ft at 10 seconds. Showers with a chance of
tstms.
.SAT...W winds 5 kt, becoming S in the afternoon. Seas 2 ft. Wave
Detail: E 2 ft at 10 seconds and SE 1 foot at 4 seconds. Showers
likely with a chance of tstms. Vsby 1 to 3 NM in the morning.
.SAT NIGHT...SE winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft
at 9 seconds and S 1 foot at 4 seconds. Showers likely with a
chance of tstms.
.SUN...NE winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds.
Showers likely with a slight chance of tstms in the morning, then
a chance of showers and tstms in the afternoon.
.SUN NIGHT...NE winds 10 to 15 kt. Seas 3 ft. A chance of tstms.
A chance of showers in the evening, then showers likely after
midnight.
.MON...N winds 15 to 20 kt. Seas 4 to 6 ft. A chance of showers
and tstms.
.MON NIGHT...N winds 20 kt. Seas 5 to 7 ft. A chance of showers
with a slight chance of tstms.
.TUE...NW winds 20 kt. Seas 7 to 9 ft. A chance of showers.
.TUE NIGHT...NW winds 15 to 20 kt. Seas 6 to 8 ft. A slight
chance of showers.

Winds and seas higher in and near tstms.

$$

AMZ374-260930-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
452 PM EDT Thu Sep 25 2025

.TONIGHT...S winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: S
3 ft at 4 seconds and E 3 ft at 10 seconds. A slight chance of
showers and tstms late this evening. A chance of showers and
tstms after midnight.
.FRI...W winds 10 to 15 kt, becoming SW 5 to 10 kt in the
afternoon. Seas 3 to 4 ft, subsiding to 2 to 3 ft in the
afternoon. Wave Detail: S 3 ft at 5 seconds and E 2 ft at
10 seconds, becoming S 2 ft at 4 seconds and E 2 ft at
10 seconds. A slight chance of showers and tstms in the morning,
then a chance of showers and tstms in the afternoon.
.FRI NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 4 seconds and E 2 ft at 10 seconds. Showers with a chance
of tstms.
.SAT...SW winds 5 to 10 kt, becoming S in the afternoon. Seas
2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at
9 seconds. Showers with a chance of tstms. Vsby 1 to 3 NM in the
morning.
.SAT NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 9 seconds and S 1 foot at 4 seconds. Showers likely with
a chance of tstms.
.SUN...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds. Showers likely with a chance of tstms.
.SUN NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Seas 3 to
4 ft, building to 4 to 5 ft after midnight. Showers likely with a
chance of tstms.
.MON...N winds 15 to 20 kt. Seas 5 to 7 ft. A chance of showers
and tstms.
.MON NIGHT...N winds 20 to 25 kt. Seas 8 to 10 ft. A chance of
showers with a slight chance of tstms.
.TUE...NW winds 20 kt. Seas 9 to 11 ft. A chance of showers.
.TUE NIGHT...NW winds 15 to 20 kt. Seas 8 to 10 ft. A chance of
showers.

Winds and seas higher in and near tstms.

$$