057
FZUS52 KCHS 212255
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
655 PM EDT Sun Sep 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-
655 PM EDT Sun Sep 21 2025

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
High pressure north of the region will weaken on Monday. A storm
system could affect the area late in the week.

$$

AMZ330-221100-
Charleston Harbor-
655 PM EDT Sun Sep 21 2025

.TONIGHT...NE winds 10 to 15 kt.
.MON...NE winds 10 to 15 kt with gusts to 20 kt. A slight chance
of showers and tstms in the afternoon.
.MON NIGHT...NE winds 10 to 15 kt.
.TUE...NE winds 10 kt, becoming E in the afternoon. A slight
chance of showers and tstms.
.TUE NIGHT...SE winds 5 to 10 kt, becoming S after midnight.
.WED...N winds 5 kt, becoming SE 10 to 15 kt in the afternoon.
.WED NIGHT...S winds 5 to 10 kt.
.THU...S winds 10 to 15 kt. A slight chance of showers and tstms.
.THU NIGHT...S winds 10 to 15 kt. A chance of showers with a
slight chance of tstms.
.FRI...S winds 10 to 15 kt. A chance of showers and tstms.
.FRI NIGHT...SW winds 10 to 15 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 80 degrees.

$$

AMZ350-221100-
Waters from South Santee River to Edisto Beach SC out 20 NM-
655 PM EDT Sun Sep 21 2025

.TONIGHT...NE winds 15 to 20 kt with gusts to 25 kt. Seas 4 to
5 ft. Wave Detail: E 5 ft at 7 seconds and SE 1 foot at
14 seconds. A slight chance of showers and tstms after midnight.
.MON...NE winds 15 kt with gusts to 20 kt. Seas 4 to 5 ft. Wave
Detail: E 4 ft at 6 seconds and SE 2 ft at 12 seconds. A slight
chance of tstms. A slight chance of showers in the morning, then
a chance of showers in the afternoon.
.MON NIGHT...NE winds 10 to 15 kt with gusts to 20 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 4 ft at
6 seconds and SE 3 ft at 11 seconds, becoming E 3 ft at 6 seconds
and SE 3 ft at 12 seconds. A slight chance of showers and tstms.
.TUE...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft
at 11 seconds and E 2 ft at 5 seconds. A slight chance of showers
and tstms.
.TUE NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas
3 to 4 ft. Wave Detail: E 4 ft at 12 seconds.
.WED...N winds 5 kt, becoming E in the afternoon. Seas 3 to 4 ft.
Wave Detail: E 3 ft at 11 seconds.
.WED NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft.
.THU...SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.THU NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of
showers with a slight chance of tstms.
.FRI...SW winds 10 to 15 kt. Seas 3 ft. A chance of showers and
tstms.
.FRI NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely
with a chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ352-221100-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
655 PM EDT Sun Sep 21 2025

.TONIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt after
midnight. Seas 4 to 5 ft. Wave Detail: E 4 ft at 7 seconds and SE
1 foot at 13 seconds. A slight chance of showers and tstms after
midnight.
.MON...NE winds 15 kt with gusts to 20 kt. Seas 4 ft. Wave
Detail: E 4 ft at 6 seconds and SE 2 ft at 12 seconds. A chance
of showers with a slight chance of tstms.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt, becoming NE
5 to 10 kt after midnight. Seas 3 to 4 ft. Wave Detail: E 4 ft at
7 seconds and SE 2 ft at 11 seconds. A slight chance of showers
and tstms.
.TUE...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft
at 6 seconds and E 3 ft at 12 seconds. A slight chance of showers
and tstms.
.TUE NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas
3 to 4 ft. Wave Detail: E 3 ft at 12 seconds.
.WED...NW winds 5 kt, becoming E in the afternoon. Seas 2 to
3 ft. Wave Detail: E 3 ft at 12 seconds.
.WED NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft.
.THU...S winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.THU NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of
showers with a slight chance of tstms.
.FRI...SW winds 10 kt. Seas 2 to 3 ft. A chance of showers and
tstms.
.FRI NIGHT...SW winds 10 kt. Seas 2 to 3 ft. Showers likely with
a chance of 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-
655 PM EDT Sun Sep 21 2025

.TONIGHT...NE winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: E
4 ft at 7 seconds and E 1 foot at 13 seconds. A slight chance of
showers and tstms after midnight.
.MON...NE winds 15 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at
7 seconds and E 1 foot at 13 seconds. A chance of showers. A
chance of tstms, mainly in the morning.
.MON NIGHT...E winds 10 to 15 kt, becoming NE 5 to 10 kt after
midnight. Seas 3 to 4 ft. Wave Detail: E 4 ft at 7 seconds and E
2 ft at 11 seconds. A slight chance of showers and tstms.
.TUE...NE winds 5 to 10 kt. Seas 3 ft. Wave Detail: E 3 ft at
7 seconds and E 3 ft at 12 seconds. A slight chance of showers
and tstms.
.TUE NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas
3 ft. Wave Detail: E 3 ft at 11 seconds.
.WED...NW winds 5 kt, becoming E in the afternoon. Seas 2 to
3 ft. Wave Detail: E 3 ft at 12 seconds.
.WED NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas
2 to 3 ft.
.THU...S winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.THU NIGHT...S winds 10 to 15 kt. Seas 3 ft. A chance of showers
with a slight chance of tstms.
.FRI...SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.FRI NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely
with a chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ374-221100-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
655 PM EDT Sun Sep 21 2025

.TONIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt late.
Seas 4 to 5 ft. Wave Detail: E 4 ft at 7 seconds and E 1 foot at
13 seconds. A slight chance of showers and tstms early this
evening, then a chance of showers and tstms late this evening.
.MON...NE winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: E 4 ft
at 7 seconds and E 2 ft at 12 seconds. A chance of showers. A
chance of tstms, mainly in the morning.
.MON NIGHT...NE winds 10 to 15 kt, becoming E 5 to 10 kt after
midnight. Seas 4 to 5 ft. Wave Detail: NE 4 ft at 7 seconds and E
3 ft at 12 seconds. A chance of showers and tstms.
.TUE...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: NE 3 ft
at 7 seconds and E 3 ft at 12 seconds. A chance of showers and
tstms.
.TUE NIGHT...Variable winds 5 kt. Seas 3 to 4 ft. Wave Detail: NE
3 ft at 8 seconds and E 3 ft at 12 seconds.
.WED...NW winds 5 kt, becoming NE in the afternoon. Seas 3 to
4 ft. Wave Detail: E 3 ft at 12 seconds and NE 2 ft at 8 seconds.
A slight chance of showers and tstms in the morning.
.WED NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas
3 ft. A slight chance of showers and tstms after midnight.
.THU...SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.THU NIGHT...S winds 10 to 15 kt. Seas 3 to 4 ft. A chance of
showers with a slight chance of tstms.
.FRI...SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers
and tstms.
.FRI NIGHT...SW winds 10 to 15 kt. Seas 3 ft. Showers likely with
a chance of tstms.

Winds and seas higher in and near tstms.

$$