310
FZUS52 KCHS 040543
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
143 AM EDT Fri Jul 4 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

AMZ300-041800-
143 AM EDT Fri Jul 4 2025

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
A weak area of low pressure will develop along a stalled front
off the Southeast coast today and could linger offshore through
the weekend. The low should then depart early next week as high
pressure builds over the region.

$$

AMZ330-041800-
Charleston Harbor-
143 AM EDT Fri Jul 4 2025

.REST OF TONIGHT...Light and variable winds, becoming NW 5 kt
late.
.FRI...NE winds 5 to 10 kt, becoming E 10 to 15 kt with gusts to
20 kt in the afternoon. A slight chance of showers and tstms in
the morning, then a chance of showers and tstms in the afternoon.
.FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. A chance of
showers and tstms.
.SAT...E winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Waves 1 to 2 ft. Showers. A chance of tstms in the
morning, then tstms likely in the afternoon.
.SAT NIGHT...E winds 10 to 15 kt with gusts to 25 kt. Showers
likely. A chance of tstms, mainly in the evening.
.SUN...E winds 10 kt, becoming SE in the afternoon. Showers
likely with a chance of tstms.
.SUN NIGHT...S winds 10 kt. A chance of showers and tstms.
.MON...SW winds 5 to 10 kt. A chance of showers and tstms.
.MON NIGHT...SW winds 5 to 10 kt. A slight chance of showers and
tstms.
.TUE...SW winds 5 to 10 kt. A chance of showers and tstms.
.TUE NIGHT...SW winds 5 to 10 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 85 degrees.

$$

AMZ350-041800-
Waters from South Santee River to Edisto Beach SC out 20 NM-
143 AM EDT Fri Jul 4 2025

.REST OF TONIGHT...SW winds 5 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 7 seconds. A slight chance of showers and tstms.
.FRI...NE winds 5 to 10 kt, becoming E 10 to 15 kt with gusts to
20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: SE 4 ft at
7 seconds. A chance of showers and tstms.
.FRI NIGHT...E winds 15 to 20 kt. Seas 4 to 5 ft. Wave Detail: SE
4 ft at 7 seconds and E 3 ft at 4 seconds. A chance of tstms. A
chance of showers in the evening, then showers likely after
midnight.
.SAT...E winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft,
building to 5 to 6 ft in the afternoon. Wave Detail: E 5 ft at
6 seconds, becoming E 6 ft at 7 seconds. Showers with a chance of
tstms.
.SAT NIGHT...E winds 15 to 20 kt with gusts to 25 kt. Seas 5 to
6 ft. Wave Detail: SE 6 ft at 7 seconds. Showers likely with a
chance of tstms.
.SUN...E winds 15 kt with gusts to 20 kt, becoming S in the
afternoon. Seas 4 to 5 ft. Wave Detail: SE 5 ft at 7 seconds.
Showers likely with a chance of tstms.
.SUN NIGHT...S winds 10 to 15 kt. Seas 4 to 5 ft. A chance of
showers and tstms.
.MON...SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers
and tstms.
.MON NIGHT...SW winds 10 to 15 kt. Seas 3 ft. A chance of showers
with a slight chance of tstms.
.TUE...SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of
showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ352-041800-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
143 AM EDT Fri Jul 4 2025

.REST OF TONIGHT...S winds 5 kt, becoming E late. Seas 2 ft. Wave
Detail: SE 2 ft at 7 seconds. A slight chance of showers and
tstms late.
.FRI...NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
to 20 kt in the afternoon. Seas 2 to 3 ft, building to 3 to 4 ft
in the afternoon. Wave Detail: SE 3 ft at 7 seconds. A chance of
showers and tstms.
.FRI NIGHT...E winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 7 seconds and E 3 ft at 4 seconds. A chance of tstms. A
chance of showers in the evening, then showers likely after
midnight.
.SAT...E winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft,
building to 5 to 6 ft in the afternoon. Wave Detail: E 4 ft at
6 seconds, becoming E 5 ft at 7 seconds. Showers with a chance of
tstms.
.SAT NIGHT...E winds 15 to 20 kt, becoming NE 10 to 15 kt after
midnight. Seas 4 to 6 ft, subsiding to 4 to 5 ft after midnight.
Wave Detail: E 5 ft at 6 seconds, becoming E 4 ft at 6 seconds.
Showers likely. A chance of tstms, mainly in the evening.
.SUN...E winds 10 to 15 kt with gusts to 20 kt, becoming S in the
afternoon. Seas 4 to 5 ft. Wave Detail: E 4 ft at 6 seconds. A
chance of showers and tstms.
.SUN NIGHT...SW winds 10 kt. Seas 3 to 4 ft. A chance of showers
and tstms.
.MON...SW winds 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...SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.TUE NIGHT...SW winds 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.

Winds and seas higher in and near tstms.

$$

AMZ354-041800-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
143 AM EDT Fri Jul 4 2025

.REST OF TONIGHT...S winds 5 kt, becoming E late. Seas 2 ft. Wave
Detail: SE 2 ft at 7 seconds. A slight chance of showers late.
.FRI...NE winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and
NE 2 ft at 3 seconds. A slight chance of showers and tstms in the
morning, then a chance of showers and tstms in the afternoon.
.FRI NIGHT...E winds 15 kt with gusts to 20 kt. Seas 3 to 4 ft.
Wave Detail: NE 3 ft at 4 seconds and SE 3 ft at 7 seconds. A
chance of tstms. A chance of showers in the evening, then showers
likely after midnight.
.SAT...NE winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft.
Wave Detail: E 5 ft at 7 seconds. Showers with a chance of tstms.
.SAT NIGHT...NE winds 15 to 20 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight. Wave Detail: E 5 ft at 7 seconds,
becoming E 4 ft at 7 seconds. Showers likely with a chance of
tstms in the evening, then a chance of showers with a slight
chance of tstms after midnight.
.SUN...SW winds 10 to 15 kt, becoming S in the afternoon. Seas
3 to 4 ft. Wave Detail: E 3 ft at 7 seconds. A chance of showers.
A slight chance of tstms in the morning, then a chance of tstms
in the afternoon.
.SUN NIGHT...SW winds 10 kt. Seas 3 to 4 ft. A chance of showers
and tstms, mainly in the evening.
.MON...SW winds 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...SW winds 10 kt. Seas 2 to 3 ft. A chance of showers and
tstms.
.TUE NIGHT...SW winds 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.

Winds and seas higher in and near tstms.

$$

AMZ374-041800-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
143 AM EDT Fri Jul 4 2025

.REST OF TONIGHT...S winds 5 kt, becoming E late. Seas 3 to 4 ft.
Wave Detail: SE 3 ft at 8 seconds. A slight chance of showers and
tstms.
.FRI...NE winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 7 seconds. A
chance of showers and tstms.
.FRI NIGHT...E winds 15 kt with gusts to 20 kt. Seas 3 to 4 ft,
building to 4 to 5 ft after midnight. Wave Detail: SE 4 ft at
7 seconds and NE 3 ft at 4 seconds, becoming SE 4 ft at 8 seconds
and NE 3 ft at 5 seconds. A chance of tstms. Showers.
.SAT...E winds 15 to 20 kt. Seas 4 to 5 ft. Wave Detail: E 5 ft
at 7 seconds. Showers with a chance of tstms.
.SAT NIGHT...NE winds 15 to 20 kt, becoming E 10 to 15 kt after
midnight. Seas 4 to 5 ft. Wave Detail: E 4 ft at 7 seconds.
Showers likely with a chance of tstms.
.SUN...SW winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: E 3 ft
at 7 seconds. A chance of tstms. Showers likely, mainly in the
morning.
.SUN NIGHT...SW winds 10 kt. Seas 3 to 4 ft. A chance of showers
and tstms.
.MON...SW winds 10 kt. Seas 3 ft. A chance of showers with a
slight chance of tstms.
.MON NIGHT...SW winds 10 kt. Seas 3 ft. A chance of showers with
a slight chance of tstms.
.TUE...SW winds 10 kt. Seas 2 to 3 ft. A slight chance of showers
and tstms.
.TUE NIGHT...SW winds 10 kt. Seas 2 to 3 ft. A chance of showers
with a slight chance of tstms.

Winds and seas higher in and near tstms.

$$