406
FZUS52 KCHS 192310
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
710 PM 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

AMZ300-201200-
710 PM 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.

$$

AMZ330-201200-
Charleston Harbor-
710 PM EDT Tue Aug 19 2025

.TONIGHT...NE winds 10 to 15 kt, becoming N late.
.WED...N winds 10 to 15 kt with gusts to 20 kt. A slight chance
of showers and tstms in the afternoon.
.WED NIGHT...N winds 10 kt. A slight chance of showers and tstms
in the evening.
.THU...NW winds 10 kt. A slight chance of showers and tstms in
the afternoon.
.THU NIGHT...SW winds 5 kt, becoming NW after midnight. A chance
of showers and tstms.
.FRI...E winds 5 to 10 kt. A chance of showers and tstms in the
morning, then showers and tstms likely in the afternoon.
.FRI NIGHT...E winds 5 to 10 kt. Showers and tstms likely, mainly
in the evening.
.SAT...E winds 5 to 10 kt. Showers likely with a chance of tstms.
.SAT NIGHT...E winds 5 to 10 kt. A chance of showers and tstms.
.SUN...E winds 5 to 10 kt. Showers likely with a chance of tstms.
.SUN 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.

$$

AMZ350-201200-
Waters from South Santee River to Edisto Beach SC out 20 NM-
710 PM EDT Tue Aug 19 2025

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

.TONIGHT...NE winds 15 to 20 kt. Seas 6 to 8 ft, building to 7 to
9 ft after midnight. Wave Detail: SE 8 ft at 17 seconds, becoming
SE 9 ft at 17 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 15 seconds. A slight chance of
tstms. A chance of showers, mainly in the morning. Vsby 1 to
3 NM.
.WED NIGHT...N winds 15 to 20 kt with gusts to 25 kt. Seas 9 to
13 ft, building to 10 to 13 ft after midnight. Wave Detail: SE
11 ft at 16 seconds and SE 8 ft at 8 seconds. A chance of showers
and tstms in the evening.
.THU...NW winds 15 to 20 kt, becoming W 10 kt in the afternoon.
Seas 9 to 11 ft, subsiding to 7 to 9 ft in the afternoon. Wave
Detail: SE 11 ft at 15 seconds and SE 6 ft at 7 seconds, becoming
E 8 ft at 14 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas 5 to 7 ft, subsiding to 4 to 6 ft after midnight. Wave
Detail: E 6 ft at 13 seconds, becoming E 5 ft at 12 seconds. A
chance of showers and tstms.
.FRI...NE winds 5 to 10 kt. Seas 4 to 5 ft, subsiding to 3 to
4 ft in the afternoon. Wave Detail: E 4 ft at 12 seconds. A
chance of showers and tstms.
.FRI NIGHT...E winds 10 kt. Seas 3 to 4 ft. A chance of showers
and tstms.
.SAT...E winds 10 kt. Seas 3 ft. Showers likely with a chance of
tstms.
.SAT NIGHT...SE winds 5 to 10 kt. Seas 3 ft. Showers likely with
a chance of tstms.
.SUN...E winds 5 to 10 kt. Seas 3 ft. Showers likely with a
chance of tstms.
.SUN NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ352-201200-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
710 PM EDT Tue Aug 19 2025

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

.TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Seas 6 to
7 ft, building to 7 to 9 ft after midnight. Wave Detail: SE 7 ft
at 16 seconds, becoming SE 8 ft at 17 seconds. A slight chance of
showers and tstms after midnight.
.WED...N winds 10 to 15 kt with gusts to 25 kt. Seas 7 to 9 ft.
Wave Detail: SE 9 ft at 16 seconds. A slight chance of showers
and tstms.
.WED NIGHT...NW winds 10 to 15 kt. Seas 8 to 10 ft, building to
9 to 11 ft after midnight. Wave Detail: SE 9 ft at 16 seconds and
SE 6 ft at 8 seconds, becoming SE 9 ft at 16 seconds and SE 7 ft
at 8 seconds. A slight chance of showers and tstms in the
evening.
.THU...NW winds 10 to 15 kt, becoming W 5 to 10 kt in the
afternoon. Seas 9 to 11 ft, subsiding to 7 to 9 ft in the
afternoon. Wave Detail: SE 10 ft at 15 seconds and SE 6 ft at
7 seconds, becoming E 8 ft at 14 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 5 to 7 ft, subsiding to
4 to 6 ft after midnight. Wave Detail: E 7 ft at 13 seconds,
becoming E 5 ft at 13 seconds. A chance of showers and tstms.
.FRI...NE winds 5 to 10 kt, becoming E in the afternoon. Seas
4 to 5 ft, subsiding to 3 to 4 ft in the afternoon. Wave Detail:
E 4 ft at 12 seconds. A chance of showers and tstms in the
morning, then showers and tstms likely in the afternoon.
.FRI NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers and
tstms likely.
.SAT...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers and tstms
likely.
.SAT NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely
with a chance of tstms.
.SUN...NE winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a
chance of tstms.
.SUN NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ354-201200-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
710 PM EDT Tue Aug 19 2025

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

.TONIGHT...NE winds 15 kt. Seas 6 to 8 ft, building to 7 to 9 ft
after midnight. Wave Detail: SE 7 ft at 17 seconds, becoming SE
8 ft at 17 seconds. A slight chance of showers and tstms early
this evening. A slight chance of showers and tstms late.
.WED...N winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 7 to 9 ft. Wave Detail: SE 8 ft at 16 seconds. A
slight chance of showers and tstms.
.WED NIGHT...NW winds 5 to 10 kt. Seas 7 to 9 ft, building to
8 to 10 ft after midnight. Wave Detail: SE 8 ft at 15 seconds and
E 6 ft at 7 seconds, becoming SE 8 ft at 16 seconds and E 6 ft at
8 seconds.
.THU...NW winds 10 kt, becoming W in the afternoon. Seas 8 to
10 ft, subsiding to 6 to 8 ft in the afternoon. Wave Detail: E
8 ft at 15 seconds and E 6 ft at 8 seconds, becoming E 7 ft at
14 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 7 ft, subsiding to
5 to 6 ft after midnight. Wave Detail: E 7 ft at 13 seconds,
becoming E 6 ft at 13 seconds. A chance of showers and tstms.
.FRI...NW winds 5 to 10 kt, becoming E in the afternoon. Seas
4 to 6 ft, subsiding to 4 to 5 ft in the afternoon. Wave Detail:
E 5 ft at 12 seconds. A chance of showers and tstms in the
morning, then showers and tstms likely in the afternoon.
.FRI NIGHT...SE winds 5 to 10 kt. Seas 3 to 4 ft. Showers and
tstms likely.
.SAT...E winds 5 to 10 kt. Seas 3 ft. Showers and tstms likely.
.SAT NIGHT...S winds 5 to 10 kt. Seas 3 ft. Showers likely with a
chance of tstms.
.SUN...NW winds 5 to 10 kt. Seas 3 ft. Showers likely with a
chance of tstms.
.SUN NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ374-201200-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
710 PM EDT Tue Aug 19 2025

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

.TONIGHT...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
9 ft at 17 seconds, becoming SE 11 ft at 17 seconds. A slight
chance of showers and tstms this evening, then a chance of
showers and tstms after midnight.
.WED...N winds 15 to 20 kt with gusts to 25 kt. Seas 9 to 11 ft.
Wave Detail: E 11 ft at 15 seconds and NE 6 ft at 6 seconds. A
chance of showers and tstms, mainly in the morning. Vsby 1 to
3 NM.
.WED NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Seas 9 to
12 ft. Wave Detail: E 12 ft at 16 seconds. A slight chance of
showers and tstms.
.THU...NW winds 10 to 15 kt with gusts to 20 kt, becoming W 5 to
10 kt in the afternoon. Seas 9 to 11 ft, subsiding to 8 to 10 ft
in the afternoon. Wave Detail: E 11 ft at 15 seconds, becoming E
9 ft at 13 seconds. A slight chance of tstms in the morning. A
slight chance of showers.
.THU NIGHT...SW winds 5 to 10 kt. Seas 7 to 9 ft, subsiding to
6 to 8 ft after midnight. Wave Detail: E 9 ft at 13 seconds,
becoming E 8 ft at 12 seconds. A chance of showers and tstms.
.FRI...NW winds 5 to 10 kt, becoming E in the afternoon. Seas
5 to 7 ft, subsiding to 4 to 6 ft in the afternoon. Wave Detail:
E 7 ft at 12 seconds, becoming E 6 ft at 12 seconds. Showers
likely with a chance of tstms.
.FRI NIGHT...E winds 5 to 10 kt. Seas 4 to 5 ft. Tstms likely.
Showers.
.SAT...SE winds 5 to 10 kt. Seas 4 to 5 ft. Showers with a chance
of tstms.
.SAT NIGHT...S winds 5 to 10 kt. Seas 4 to 5 ft. Showers likely
with a chance of tstms.
.SUN...W winds 5 to 10 kt. Seas 4 to 5 ft. Showers likely with a
chance of tstms.
.SUN NIGHT...SW 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.

$$