893
FZUS52 KCHS 220244
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
1044 PM EDT Thu Aug 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

AMZ300-221515-
1044 PM EDT Thu Aug 21 2025

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
Weak high pressure will extend across the area tonight. A cold
front will stall over the Lowcountry and Southeast Georgia Friday
and will linger into the weekend. A much stronger cold front will
clear the area Monday with high pressure prevailing through the
middle of next week.

$$

AMZ330-221515-
Charleston Harbor-
1044 PM EDT Thu Aug 21 2025

.TONIGHT...S winds 5 to 10 kt, becoming NW late. A slight chance
of showers and tstms early this evening, then a chance of showers
and tstms late this evening.
.FRI...E winds 5 to 10 kt. Showers and tstms.
.FRI NIGHT...E winds 5 to 10 kt. Showers likely. Tstms likely,
mainly in the evening.
.SAT...E winds 10 kt. Showers likely. A chance of tstms in the
morning, then tstms likely in the afternoon.
.SAT NIGHT...NE winds 5 to 10 kt. Showers likely. Tstms likely,
mainly in the evening.
.SUN...N winds 5 kt, becoming E in the afternoon. Showers likely
with a chance of tstms.
.SUN NIGHT...W winds 5 kt. A chance of tstms. Showers likely,
mainly in the evening.
.MON...W winds 5 to 10 kt. A chance of showers and tstms.
.MON NIGHT...SW winds 5 to 10 kt.
.TUE...NE winds 5 to 10 kt.
.TUE NIGHT...SW winds 5 kt.

Winds and waves higher in and near tstms.

Unless otherwise noted, waves 1 foot or less.

Charleston Harbor water temperature 85 degrees.

$$

AMZ350-221515-
Waters from South Santee River to Edisto Beach SC out 20 NM-
1044 PM EDT Thu Aug 21 2025

.TONIGHT...SW winds 5 to 10 kt, becoming W late. Seas 3 to 4 ft,
subsiding to 2 to 3 ft after midnight. Wave Detail: E 4 ft at
12 seconds, becoming E 3 ft at 12 seconds. A slight chance of
showers and tstms early this evening, then a chance of showers
and tstms late this evening.
.FRI...NE winds 5 to 10 kt, becoming E 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 11 seconds.
Showers and tstms likely. Vsby 1 to 3 NM in the afternoon.
.FRI NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E
4 ft at 12 seconds and SE 2 ft at 8 seconds. Showers and tstms
likely in the evening, then showers likely with a chance of tstms
after midnight with vsby 1 to 3 NM.
.SAT...E winds 10 to 15 kt. Seas 3 to 4 ft, building to 4 to 5 ft
in the afternoon. Wave Detail: E 4 ft at 12 seconds and SE 3 ft
at 8 seconds, becoming E 3 ft at 6 seconds and E 3 ft at
12 seconds. Showers with tstms likely.
.SAT NIGHT...E winds 10 to 15 kt, diminishing to 5 to 10 kt after
midnight. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight.
Wave Detail: E 3 ft at 5 seconds and E 2 ft at 12 seconds.
Showers likely. Tstms likely, mainly in the evening.
.SUN...NE winds 5 to 10 kt. Seas 3 ft. Wave Detail: E 3 ft at
12 seconds and E 2 ft at 5 seconds. Showers likely with a chance
of tstms.
.SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers and tstms.
.MON...W winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.MON NIGHT...SW winds 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.TUE...NE winds 5 to 10 kt. Seas 3 to 4 ft.
.TUE NIGHT...SW winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance
of showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ352-221515-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
1044 PM EDT Thu Aug 21 2025

.TONIGHT...S winds 5 to 10 kt. Seas 3 to 4 ft, subsiding to 2 to
3 ft after midnight. Wave Detail: E 4 ft at 13 seconds, becoming E
3 ft at 12 seconds. A chance of showers and tstms.
.FRI...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
12 seconds. Showers with tstms likely.
.FRI NIGHT...E winds 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft
at 12 seconds. Showers with tstms likely. Vsby 1 to 3 NM.
.SAT...E winds 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at
12 seconds and SE 1 foot at 7 seconds. Showers with tstms likely.
.SAT NIGHT...NE winds 5 to 10 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight. Wave Detail: E 3 ft at 12 seconds and
SE 1 foot at 7 seconds, becoming E 3 ft at 12 seconds. Showers
with tstms likely in the evening, then showers likely with a
chance of tstms after midnight.
.SUN...N winds 5 to 10 kt, becoming NW in the afternoon. Seas
2 to 3 ft. Wave Detail: E 3 ft at 12 seconds. Showers likely with
a chance of tstms.
.SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
tstms. Showers likely, mainly in the evening.
.MON...W winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance
of showers and tstms.
.TUE...NE winds 5 to 10 kt. Seas 3 to 4 ft.
.TUE NIGHT...S winds 5 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ354-221515-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
1044 PM EDT Thu Aug 21 2025

.TONIGHT...S winds 5 to 10 kt, becoming SW late. Seas 3 to 4 ft,
subsiding to 2 to 3 ft after midnight. Wave Detail: E 4 ft at
13 seconds, becoming E 3 ft at 12 seconds. A chance of showers
and tstms.
.FRI...NW winds 5 kt, becoming E in the afternoon. Seas 2 to
3 ft. Wave Detail: E 3 ft at 12 seconds. Showers likely with a
chance of tstms in the morning, then showers and tstms in the
afternoon.
.FRI NIGHT...SE winds 5 to 10 kt. Seas 3 ft. Wave Detail: E 3 ft
at 11 seconds. Showers with tstms likely in the evening, then
showers with a chance of tstms after midnight with vsby 1 NM or
less.
.SAT...E winds 5 to 10 kt. Seas 3 ft. Wave Detail: E 3 ft at
12 seconds. Showers with a chance of tstms in the morning, then
showers with tstms likely in the afternoon. Vsby 1 to 3 NM in the
morning.
.SAT NIGHT...E winds 5 to 10 kt, becoming N after midnight. Seas
3 to 4 ft. Wave Detail: E 3 ft at 12 seconds and S 1 foot at
4 seconds. Showers with tstms likely in the evening, then showers
likely with a chance of tstms after midnight.
.SUN...NW winds 5 to 10 kt. Seas 3 ft. Wave Detail: E 3 ft at
12 seconds and S 1 foot at 4 seconds. Showers likely with a
chance of tstms.
.SUN NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
tstms. Showers likely, mainly in the evening.
.MON...W winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance
of showers and tstms.
.TUE...N winds 5 to 10 kt. Seas 2 to 3 ft.
.TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

$$

AMZ374-221515-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
1044 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT FRIDAY...

.TONIGHT...S winds 5 to 10 kt, becoming SW late. Seas 4 to 6 ft.
Wave Detail: E 5 ft at 13 seconds. A slight chance of showers and
tstms early this evening, then a chance of showers and tstms late
this evening.
.FRI...W winds 5 kt, becoming E in the afternoon. Seas 4 to 5 ft.
Wave Detail: E 5 ft at 12 seconds. Tstms likely. Showers.
.FRI NIGHT...SE winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: E
5 ft at 11 seconds and SE 1 foot at 8 seconds. Showers with tstms
likely. Vsby 1 to 3 NM after midnight.
.SAT...E winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: E 5 ft at
12 seconds and SE 1 foot at 8 seconds. Showers. Tstms likely,
mainly in the morning.
.SAT NIGHT...E winds 5 to 10 kt, becoming W after midnight. Seas
4 to 5 ft. Wave Detail: E 4 ft at 12 seconds and SE 1 foot at
7 seconds. Showers with a chance of tstms.
.SUN...NW winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: E 4 ft
at 12 seconds and SE 1 foot at 8 seconds. A chance of tstms.
Showers.
.SUN NIGHT...W winds 5 to 10 kt. Seas 3 to 4 ft. Showers likely
with a chance of tstms.
.MON...W winds 5 to 10 kt. Seas 3 to 4 ft. A chance of showers
and tstms.
.MON NIGHT...SW winds 5 to 10 kt. Seas 3 to 4 ft. A chance of
showers and tstms.
.TUE...N winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance of
showers and tstms.
.TUE NIGHT...S winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance
of showers and tstms.

Winds and seas higher in and near tstms.

$$