756
FZUS52 KCHS 181743
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
143 PM EDT Mon Aug 18 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

AMZ300-190615-
143 PM EDT Mon Aug 18 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.

$$

AMZ330-190615-
Charleston Harbor-
143 PM EDT Mon Aug 18 2025

.REST OF TODAY...SE winds 5 to 10 kt.
.TONIGHT...SE winds 5 kt, becoming NE after midnight.
.TUE...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.
.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 with gusts to 20 kt. A slight chance
of showers 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...N winds 10 kt.
.THU NIGHT...E winds 5 to 10 kt. A slight chance of showers and
tstms.
.FRI...E winds 5 to 10 kt. A chance of showers and tstms.
.FRI NIGHT...E 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.

$$

AMZ350-190615-
Waters from South Santee River to Edisto Beach SC out 20 NM-
143 PM EDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY AFTERNOON...

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

Winds and seas higher in and near tstms.

$$

AMZ352-190615-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
143 PM EDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY AFTERNOON...

.REST OF TODAY...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail:
E 2 ft at 8 seconds and SE 1 foot at 16 seconds.
.TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft, building to 3 to
4 ft after midnight. Wave Detail: SE 3 ft at 15 seconds and E
2 ft at 8 seconds, becoming SE 4 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 5 ft at 17 seconds,
becoming SE 7 ft at 17 seconds. A slight chance of showers and
tstms in the morning, then a chance of showers and 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 8 ft at 15 seconds,
becoming SE 9 ft at 16 seconds. A chance of showers. A chance of
tstms, mainly in the evening.
.WED...N winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 9 to 11 ft. Wave Detail: SE 10 ft at 15 seconds
and SE 6 ft at 8 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. Seas 9 to 11 ft. Wave Detail:
SE 10 ft at 15 seconds. A chance of showers and tstms in the
evening.
.THU...N winds 10 to 15 kt. Seas 8 to 10 ft.
.THU NIGHT...SE winds 5 to 10 kt. Seas 6 to 8 ft. A chance of
showers and tstms.
.FRI...E winds 5 to 10 kt. Seas 4 to 6 ft. A chance of showers
and tstms.
.FRI NIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. A chance of
showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ354-190615-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
143 PM EDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY AFTERNOON...

.REST OF TODAY...NE winds 10 kt. Seas 2 to 3 ft. Wave Detail: E
2 ft at 8 seconds and SE 1 foot at 16 seconds. A slight chance of
showers and tstms early this afternoon.
.TONIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft, building to 4 to
5 ft after midnight. Wave Detail: E 3 ft at 8 seconds and SE 3 ft
at 15 seconds, becoming E 4 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: E 6 ft at 17 seconds,
becoming SE 7 ft at 17 seconds. A slight chance of showers and
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 8 ft at 15 seconds,
becoming SE 8 ft at 16 seconds and E 6 ft at 8 seconds. A chance
of showers. A chance of tstms, mainly in the evening.
.WED...N winds 15 to 20 kt. Seas 9 to 11 ft. Wave Detail: SE 9 ft
at 16 seconds and E 7 ft at 8 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 kt. Seas 8 to 10 ft. Wave Detail: SE 9 ft
at 15 seconds and E 6 ft at 8 seconds. A chance of showers and
tstms in the evening.
.THU...N winds 10 to 15 kt. Seas 7 to 9 ft. A slight chance of
showers and tstms.
.THU NIGHT...SE winds 5 to 10 kt. Seas 6 to 8 ft. A chance of
showers and tstms.
.FRI...E winds 5 to 10 kt. Seas 5 to 7 ft. A chance of showers
and tstms.
.FRI NIGHT...E winds 10 kt. Seas 4 to 6 ft. A chance of showers
and tstms.

Winds and seas higher in and near tstms.

$$

AMZ374-190615-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
143 PM EDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EDT TONIGHT
THROUGH SATURDAY MORNING...

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

Winds and seas higher in and near tstms.

$$