244
FZUS52 KCHS 190555
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
155 AM EDT Tue Aug 19 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

AMZ300-191800-
155 AM EDT Tue Aug 19 2025

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
Weak high pressure will build into the region early this week as
Hurricane Erin passes well offshore through the middle of the
week. The pattern may become more unsettled again late week and
into this weekend.

$$

AMZ330-191800-
Charleston Harbor-
155 AM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 5 kt, becoming NE late.
.TUE...NE winds 5 to 10 kt, becoming E 10 to 15 kt in the
afternoon. A chance of showers and tstms in the afternoon.
.TUE NIGHT...NE winds 10 to 15 kt. A slight chance of showers and
tstms in the evening.
.WED...N winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Waves 1 to 2 ft. A slight chance of showers and tstms
in the morning, then a chance of showers and tstms in the
afternoon.
.WED NIGHT...N winds 10 to 15 kt. A chance of showers and tstms
in the evening.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. A slight chance
of showers and tstms in the afternoon.
.THU NIGHT...S winds 10 to 15 kt, becoming SE 5 to 10 kt after
midnight. A chance of showers and tstms.
.FRI...E winds 10 to 15 kt. Showers and tstms likely.
.FRI NIGHT...E winds 10 to 15 kt. A chance of showers and tstms.
.SAT...E winds 5 to 10 kt. Showers likely with a chance of tstms.
.SAT NIGHT...SE 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.

$$

AMZ350-191800-
Waters from South Santee River to Edisto Beach SC out 20 NM-
155 AM EDT Tue Aug 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON...

.REST OF TONIGHT...E winds 5 to 10 kt. Seas 4 to 5 ft. Wave
Detail: SE 5 ft at 14 seconds.
.TUE...NE winds 10 to 15 kt. Seas 4 to 6 ft, building to 6 to
8 ft in the afternoon. Wave Detail: SE 6 ft at 17 seconds,
becoming SE 7 ft at 15 seconds. A slight chance of showers. A
slight chance of tstms in the afternoon.
.TUE NIGHT...NE winds 15 to 20 kt. Seas 7 to 9 ft, building to
8 to 10 ft after midnight. Wave Detail: SE 9 ft at 16 seconds,
becoming SE 9 ft at 15 seconds. A slight chance of showers and
tstms after midnight.
.WED...N winds 15 to 20 kt, increasing to 20 to 25 kt in the
afternoon. Seas 9 to 11 ft, building to 9 to 13 ft in the
afternoon. Wave Detail: SE 10 ft at 16 seconds, becoming SE 11 ft
at 16 seconds and SE 7 ft at 8 seconds. A chance of showers and
tstms.
.WED NIGHT...N winds 20 to 25 kt with gusts to 30 kt. Seas 11 to
15 ft. Wave Detail: SE 12 ft at 16 seconds and SE 9 ft at
8 seconds. A chance of showers and tstms, mainly in the evening.
.THU...NW winds 15 to 20 kt with gusts to 25 kt. Seas 10 to
14 ft, subsiding to 8 to 10 ft in the afternoon. Wave Detail: SE
12 ft at 15 seconds and SE 8 ft at 8 seconds, becoming E 9 ft at
14 seconds and SE 5 ft at 7 seconds.
.THU NIGHT...S winds 10 to 15 kt with gusts to 20 kt, becoming SE
after midnight. Seas 6 to 8 ft, subsiding to 4 to 6 ft after
midnight. A chance of showers and tstms.
.FRI...E winds 10 to 15 kt. Seas 4 to 5 ft. A chance of showers
and tstms.
.FRI NIGHT...E winds 10 to 15 kt. Seas 4 to 5 ft. A chance of
showers and tstms.
.SAT...E winds 10 kt. Seas 3 to 4 ft. Showers likely with a
chance of tstms.
.SAT NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Showers likely
with a chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ352-191800-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
155 AM EDT Tue Aug 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON...

.REST OF TONIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: SE 4 ft at 14 seconds.
.TUE...NE winds 10 to 15 kt. Seas 4 to 5 ft, building to 5 to
7 ft in the afternoon. Wave Detail: SE 5 ft at 16 seconds,
becoming SE 6 ft at 16 seconds. A chance of showers and tstms in
the afternoon.
.TUE NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Seas 6 to
8 ft, building to 7 to 9 ft after midnight. Wave Detail: SE 8 ft
at 16 seconds, becoming SE 9 ft at 16 seconds. A slight chance of
showers and tstms after midnight.
.WED...N winds 15 to 20 kt with gusts to 25 kt. Seas 8 to 10 ft,
building to 9 to 11 ft in the afternoon. Wave Detail: SE 9 ft at
15 seconds, becoming SE 10 ft at 16 seconds. A chance of showers
and tstms.
.WED NIGHT...N winds 15 kt with gusts to 20 kt. Seas 9 to 11 ft,
building to 9 to 12 ft after midnight. Wave Detail: SE 10 ft at
16 seconds and SE 6 ft at 6 seconds, becoming SE 10 ft at
16 seconds and SE 7 ft at 8 seconds. A chance of showers and
tstms in the evening.
.THU...NW winds 10 to 15 kt with gusts to 20 kt, becoming W in
the afternoon. Seas 9 to 12 ft, subsiding to 8 to 10 ft in the
afternoon. Wave Detail: SE 10 ft at 15 seconds and SE 7 ft at
8 seconds, becoming E 9 ft at 15 seconds and E 5 ft at 7 seconds.
A slight chance of showers and tstms in the afternoon.
.THU NIGHT...SW winds 5 to 10 kt. Seas 6 to 8 ft, subsiding to
5 to 7 ft after midnight. A chance of showers and tstms.
.FRI...E winds 10 to 15 kt. Seas 4 to 5 ft. Showers and tstms
likely.
.FRI NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely
with a chance of tstms.
.SAT...E winds 5 to 10 kt. Seas 3 ft. Showers likely with a
chance of tstms.
.SAT NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely
with a chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ354-191800-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
155 AM EDT Tue Aug 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON...

.REST OF TONIGHT...E winds 5 to 10 kt. Seas 4 to 5 ft. Wave
Detail: E 4 ft at 14 seconds.
.TUE...NE winds 10 to 15 kt. Seas 4 to 6 ft, building to 5 to
7 ft in the afternoon. Wave Detail: E 5 ft at 16 seconds,
becoming SE 6 ft at 16 seconds. A slight chance of showers and
tstms in the afternoon.
.TUE NIGHT...NE winds 15 to 20 kt. Seas 6 to 8 ft, building to
7 to 9 ft after midnight. Wave Detail: SE 7 ft at 16 seconds,
becoming SE 8 ft at 16 seconds. A slight chance of showers and
tstms.
.WED...N winds 15 to 20 kt with gusts to 25 kt. Seas 8 to 10 ft.
Wave Detail: SE 9 ft at 15 seconds and E 6 ft at 6 seconds. A
chance of showers. A slight chance of tstms in the morning, then
a chance of tstms in the afternoon.
.WED NIGHT...N winds 10 to 15 kt with gusts to 20 kt, becoming NW
after midnight. Seas 8 to 10 ft, building to 9 to 11 ft after
midnight. Wave Detail: SE 9 ft at 16 seconds and E 7 ft at
8 seconds, becoming E 9 ft at 16 seconds and E 7 ft at 8 seconds.
A chance of showers and tstms in the evening.
.THU...NW winds 10 to 15 kt, becoming E 5 to 10 kt in the
afternoon. Seas 9 to 11 ft, subsiding to 7 to 9 ft in the
afternoon. Wave Detail: E 9 ft at 15 seconds and E 6 ft at
8 seconds, becoming E 8 ft at 15 seconds and E 6 ft at 7 seconds.
A slight chance of showers and tstms in the afternoon.
.THU NIGHT...S winds 10 kt, becoming SW after midnight. Seas 7 to
8 ft, subsiding to 6 to 8 ft after midnight. A chance of showers
and tstms.
.FRI...E winds 5 to 10 kt. Seas 5 to 7 ft. Showers and tstms
likely.
.FRI NIGHT...E winds 10 kt. Seas 4 to 5 ft. Showers likely with a
chance of tstms.
.SAT...E winds 10 kt. Seas 3 to 4 ft. Showers and tstms likely.
.SAT NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Showers likely
with a chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ374-191800-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
155 AM EDT Tue Aug 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING...

.REST OF TONIGHT...E winds 10 kt. Seas 4 to 6 ft. Wave Detail: SE
5 ft at 14 seconds and E 3 ft at 7 seconds.
.TUE...NE winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Seas 6 to 8 ft, building to 7 to 9 ft in the
afternoon. Wave Detail: SE 7 ft at 16 seconds and E 3 ft at
7 seconds, becoming SE 8 ft at 15 seconds. A slight chance of
showers. A slight chance of tstms in the afternoon.
.TUE NIGHT...NE winds 15 to 20 kt with gusts to 25 kt. Seas 8 to
10 ft, building to 9 to 11 ft after midnight. Wave Detail: SE
10 ft at 16 seconds, becoming SE 11 ft at 15 seconds. A chance of
showers and tstms after midnight.
.WED...N winds 20 to 25 kt with gusts to 30 kt. Seas 9 to 13 ft,
building to 10 to 13 ft in the afternoon. Wave Detail: E 12 ft at
15 seconds, becoming SE 11 ft at 16 seconds. A chance of showers
and tstms.
.WED NIGHT...NW winds 15 to 20 kt with gusts to 25 kt. Seas 10 to
13 ft. Wave Detail: E 13 ft at 15 seconds. A chance of showers
and tstms, mainly in the evening.
.THU...NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 10 to 13 ft, subsiding to 9 to 11 ft in the
afternoon. Wave Detail: E 12 ft at 15 seconds, becoming E 11 ft
at 14 seconds. A slight chance of showers and tstms.
.THU NIGHT...S winds 10 to 15 kt, becoming SW after midnight.
Seas 9 to 11 ft, subsiding to 7 to 9 ft after midnight. A chance
of showers and tstms.
.FRI...E winds 5 to 10 kt. Seas 5 to 7 ft. Showers and tstms
likely.
.FRI NIGHT...E winds 10 kt. Seas 4 to 6 ft. Showers likely with a
chance of tstms.
.SAT...E winds 10 kt. Seas 4 to 6 ft. Showers likely with a
chance of tstms.
.SAT NIGHT...SE winds 5 to 10 kt. Seas 4 to 5 ft. Showers likely
with a chance of tstms.

Winds and seas higher in and near tstms.

$$