648
FZUS52 KCHS 212250
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
649 PM EDT Mon Jul 21 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

AMZ300-221100-
649 PM EDT Mon Jul 21 2025

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
High pressure will prevail in the Atlantic through tonight, with
surface troughing inland. A weak front should stall over or near
our area Tuesday through Thursday, then dissipate on Friday.
Surface troughing returns this weekend.

$$

AMZ330-221100-
Charleston Harbor-
649 PM EDT Mon Jul 21 2025

.TONIGHT...SW winds 10 kt, diminishing to 5 kt late this evening,
then becoming NW late. A chance of showers and tstms early this
evening, then a slight chance of showers and tstms late this
evening.
.TUE...NE winds 5 to 10 kt. A chance of showers and tstms in the
morning, then showers and tstms likely in the afternoon.
.TUE NIGHT...NE winds 5 to 10 kt. Showers likely. Tstms likely,
mainly in the evening.
.WED...E winds 10 to 15 kt. Showers likely. A chance of tstms in
the morning, then tstms likely in the afternoon.
.WED NIGHT...SE winds 5 to 10 kt. Showers likely with a chance of
tstms.
.THU...SE winds 5 to 10 kt. Showers likely with a chance of
tstms.
.THU NIGHT...S winds 5 to 10 kt. A chance of showers and tstms,
mainly in the evening.
.FRI...S winds 5 to 10 kt. A chance of showers and tstms.
.FRI NIGHT...SW winds 5 to 10 kt. A slight chance of showers and
tstms.
.SAT...SW winds 5 to 10 kt. A slight chance of showers and tstms.
.SAT NIGHT...SW winds 5 to 10 kt. A slight 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 85 degrees.

$$

AMZ350-221100-
Waters from South Santee River to Edisto Beach SC out 20 NM-
649 PM EDT Mon Jul 21 2025

.TONIGHT...SW winds 5 to 10 kt, becoming NW late. Seas 2 ft. Wave
Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. A slight
chance of showers and tstms early this evening.
.TUE...NE winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 1 foot at
2 seconds and S 1 foot at 4 seconds. A chance of showers and
tstms in the morning, then showers and tstms likely in the
afternoon.
.TUE NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E
2 ft at 3 seconds and S 1 foot at 5 seconds. Showers. Tstms
likely, mainly in the evening.
.WED...E winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft
at 4 seconds and S 2 ft at 7 seconds. Showers. A chance of tstms
in the morning, then tstms likely in the afternoon.
.WED NIGHT...SE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E
2 ft at 6 seconds. Showers likely with a chance of tstms.
.THU...S winds 10 kt. Seas 2 ft. Wave Detail: S 2 ft at 5 seconds
and NE 1 foot at 5 seconds. Showers likely with a chance of
tstms.
.THU NIGHT...S winds 5 to 10 kt. Seas 2 ft. A chance of showers
and tstms.
.FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.FRI NIGHT...SW winds 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.SAT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.SAT NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight
chance of showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ352-221100-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
649 PM EDT Mon Jul 21 2025

.TONIGHT...SW winds 5 to 10 kt, becoming W late. Seas 2 ft. Wave
Detail: S 2 ft at 4 seconds and SE 1 foot at 8 seconds.
.TUE...NW winds 5 kt, becoming E in the afternoon. Seas 2 ft.
Wave Detail: S 1 foot at 4 seconds and SE 1 foot at 8 seconds. A
chance of showers and tstms in the morning, then showers and
tstms likely in the afternoon.
.TUE NIGHT...NE winds 10 kt. Seas 2 ft. Wave Detail: E 1 foot at
3 seconds and S 1 foot at 5 seconds. Showers. Tstms likely,
mainly in the evening.
.WED...E winds 10 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at
3 seconds and S 2 ft at 7 seconds. Showers with a chance of
tstms.
.WED NIGHT...SE winds 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft
at 5 seconds. Showers likely. Tstms likely, mainly in the
evening.
.THU...S winds 5 to 10 kt. Seas 2 ft. Wave Detail: S 2 ft at
5 seconds and NE 1 foot at 4 seconds. Showers likely with a
chance of tstms.
.THU NIGHT...S winds 5 to 10 kt. Seas 2 ft. A chance of showers
and tstms.
.FRI...S winds 5 to 10 kt. Seas 2 ft. A chance of showers and
tstms.
.FRI NIGHT...SW winds 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.SAT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.SAT NIGHT...SW winds 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ354-221100-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
649 PM EDT Mon Jul 21 2025

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

Winds and seas higher in and near tstms.

$$

AMZ374-221100-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
649 PM EDT Mon Jul 21 2025

.TONIGHT...SW winds 10 kt. Seas 2 ft. Wave Detail: SW 2 ft at
4 seconds and SE 2 ft at 8 seconds.
.TUE...NW winds 5 to 10 kt, becoming SW in the afternoon. Seas
2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 8 seconds.
A chance of showers and tstms.
.TUE NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 5 seconds and SE 1 foot at 8 seconds. Showers. Tstms
likely, mainly in the evening.
.WED...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft
at 7 seconds and NE 1 foot at 3 seconds. Showers with a chance of
tstms.
.WED NIGHT...SE winds 10 kt. Seas 2 ft. Wave Detail: S 2 ft at
5 seconds and SE 2 ft at 8 seconds. Showers likely with a chance
of tstms.
.THU...S winds 10 kt. Seas 2 ft. Wave Detail: S 2 ft at 5 seconds
and NE 1 foot at 5 seconds. Showers likely with a chance of
tstms.
.THU NIGHT...S 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.
.FRI...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.FRI NIGHT...S winds 10 kt. Seas 3 ft. A chance of showers and
tstms.
.SAT...SW winds 5 to 10 kt. Seas 3 ft. A slight chance of showers
and tstms.
.SAT NIGHT...SW winds 10 kt. Seas 3 ft. A slight chance of
showers and tstms.

Winds and seas higher in and near tstms.

$$