660
FZUS52 KCHS 202345
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
745 PM EDT Thu Aug 20 2026

South Santee River SC to Altamaha Sound GA out 60 NM, including
Charleston Harbor and Grays Reef National Marine Sanctuary

AMZ300-211300-
745 PM EDT Thu Aug 20 2026

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
Typical summertime conditions will persist across the local
waters through the weekend. Southwest winds could increase late
in the weekend as a front settles into the region.

$$

AMZ340-211300-
Charleston Harbor-
745 PM EDT Thu Aug 20 2026

.TONIGHT...S winds 5 to 10 kt, becoming SW after midnight.
.FRI...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts to
20 kt in the afternoon.
.FRI NIGHT...SW winds 10 to 15 kt. A chance of showers and tstms.
.SAT...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. A chance of tstms. A chance of showers in the morning,
then showers likely in the afternoon.
.SAT NIGHT...SW winds 5 to 10 kt. A chance of tstms. Showers
likely, mainly in the evening.
.SUN...SW winds 5 to 10 kt. A slight chance of showers and tstms
in the afternoon.
.SUN NIGHT...SW winds 5 to 10 kt. A slight chance of showers and
tstms.
.MON...SW winds 5 to 10 kt. A slight chance of showers and tstms.
.MON NIGHT...S winds 5 kt. A slight chance of showers and tstms.
.TUE...SW winds 5 to 10 kt. A chance of showers and tstms.
.TUE NIGHT...S 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 88 degrees.

$$

AMZ360-211300-
Coastal waters from South Santee River to Edisto Beach SC out
20 NM-
745 PM EDT Thu Aug 20 2026

.TONIGHT...S winds 10 to 15 kt, becoming SW after midnight. Seas
2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and SE 2 ft at
8 seconds.
.FRI...SW winds 10 to 15 kt, becoming S 15 to 20 kt in the
afternoon. Seas 2 to 3 ft, building to 3 to 4 ft in the
afternoon. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at
8 seconds, becoming S 3 ft at 4 seconds and SE 2 ft at 8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to
4 ft. Wave Detail: S 4 ft at 5 seconds and SE 1 foot at
8 seconds. A chance of showers and tstms.
.SAT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft
at 5 seconds and E 1 foot at 8 seconds. A chance of tstms. A
chance of showers.
.SAT NIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 ft.
Wave Detail: S 3 ft at 5 seconds and E 1 foot at 9 seconds.
Showers likely with a chance of tstms.
.SUN...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft
at 5 seconds and E 1 foot at 9 seconds. A chance of showers and
tstms, mainly in the morning.
.SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight
chance of showers and tstms.
.MON...SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.MON NIGHT...S winds 5 to 10 kt. Seas 2 ft. A slight chance of
showers and tstms.
.TUE...SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and
tstms.
.TUE NIGHT...S winds 10 kt. Seas 2 ft. A chance of showers and
tstms.

Winds and seas higher in and near tstms.

$$

AMZ362-211300-
Coastal waters from Edisto Beach SC to Savannah GA out 20 NM-
745 PM EDT Thu Aug 20 2026

.TONIGHT...S winds 10 to 15 kt, becoming SW late. Seas 2 to 3 ft.
Wave Detail: S 2 ft at 4 seconds and SE 2 ft at 8 seconds.
.FRI...SW winds 10 to 15 kt, becoming S 15 to 20 kt with gusts to
25 kt in the afternoon. Seas 2 to 3 ft, building to 3 to 4 ft in
the afternoon. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at
8 seconds, becoming S 3 ft at 4 seconds and SE 1 foot at
8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to
4 ft. Wave Detail: S 4 ft at 5 seconds and SE 1 foot at
8 seconds. A chance of showers and tstms.
.SAT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft
at 5 seconds and SE 1 foot at 8 seconds. A chance of showers and
tstms.
.SAT NIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 5 seconds and E 1 foot at 9 seconds.
A chance of showers and tstms.
.SUN...W winds 5 to 10 kt, becoming SW 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and E
1 foot at 9 seconds. A slight chance of showers and tstms in the
morning.
.SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight
chance of showers and tstms.
.MON...SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.MON NIGHT...S winds 5 to 10 kt. Seas 2 ft. A slight chance of
showers and tstms.
.TUE...SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and
tstms.
.TUE NIGHT...SW winds 10 kt. Seas 2 ft. A chance of showers and
tstms.

Winds and seas higher in and near tstms.

$$

AMZ364-211300-
Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm,
including Grays Reef National Marine Sanctuary-
745 PM EDT Thu Aug 20 2026

.TONIGHT...S winds 10 to 15 kt, becoming SW late. Seas 2 to 3 ft.
Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 9 seconds.
.FRI...SW winds 10 to 15 kt, becoming S 15 to 20 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and
SE 1 foot at 8 seconds.
.FRI NIGHT...S winds 15 to 20 kt, becoming SW 10 to 15 kt after
midnight. Seas 3 to 4 ft, subsiding to 2 to 3 ft after midnight.
Wave Detail: S 4 ft at 5 seconds and SE 1 foot at 8 seconds,
becoming S 3 ft at 5 seconds and SE 1 foot at 8 seconds. A chance
of showers and tstms.
.SAT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 4 seconds and SE 1 foot at 8 seconds. A slight chance of
showers and tstms in the morning, then a chance of showers and
tstms in the afternoon.
.SAT NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S
3 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of showers
and tstms.
.SUN...W winds 10 to 15 kt, becoming S in the afternoon. Seas
2 to 3 ft. Wave Detail: S 2 ft at 5 seconds and SE 1 foot at
9 seconds.
.SUN NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft.
.MON...SW winds 5 to 10 kt. Seas 2 to 3 ft.
.MON NIGHT...S winds 10 to 15 kt. Seas 2 ft. A slight chance of
showers and tstms.
.TUE...S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers
and tstms.
.TUE NIGHT...S winds 10 to 15 kt. Seas 2 ft. A chance of showers
and tstms.

Winds and seas higher in and near tstms.

$$

AMZ380-211300-
Waters from South Santee River SC to Edisto Beach SC extending
from 20 to 60 NM-
745 PM EDT Thu Aug 20 2026

.TONIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt after
midnight. Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and SE
2 ft at 8 seconds.
.FRI...SW winds 10 to 15 kt, becoming S 15 to 20 kt in the
afternoon. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and
SE 2 ft at 8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to
4 ft. Wave Detail: SW 4 ft at 5 seconds and E 2 ft at 9 seconds.
A chance of showers and tstms.
.SAT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft
at 5 seconds and E 2 ft at 9 seconds. A chance of tstms. A chance
of showers.
.SAT NIGHT...SW winds 15 kt with gusts to 20 kt. Seas 3 to 4 ft.
Wave Detail: SW 3 ft at 5 seconds and E 1 foot at 9 seconds. A
chance of tstms. Showers.
.SUN...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft
at 5 seconds and E 1 foot at 9 seconds. Showers with a chance of
tstms in the morning, then a chance of showers with a slight
chance of tstms in the afternoon.
.SUN NIGHT...SW winds 10 to 15 kt. Seas 3 ft. A slight chance of
showers and tstms.
.MON...SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.MON NIGHT...SW winds 5 to 10 kt. Seas 2 ft. A chance of showers
and tstms.
.TUE...SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and
tstms.
.TUE NIGHT...S winds 10 kt. Seas 2 to 3 ft. Showers likely with a
chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ382-211300-
Waters from Edisto Beach SC to Savannah GA extending from 20 to
60 NM-
745 PM EDT Thu Aug 20 2026

.TONIGHT...S winds 10 to 15 kt, becoming SW late. Seas 2 to 3 ft.
Wave Detail: S 2 ft at 4 seconds and SE 2 ft at 9 seconds.
.FRI...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and
SE 2 ft at 8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to
4 ft. Wave Detail: S 4 ft at 5 seconds and SE 1 foot at
9 seconds. A chance of showers and tstms.
.SAT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft
at 5 seconds and SE 1 foot at 8 seconds. A chance of showers. A
chance of tstms, mainly in the morning.
.SAT NIGHT...SW winds 15 kt with gusts to 20 kt. Seas 3 to 4 ft.
Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 9 seconds.
Showers likely with a chance of tstms.
.SUN...SW winds 10 to 15 kt. Seas 3 to 4 ft, subsiding to 2 to
3 ft in the afternoon. Wave Detail: SW 3 ft at 5 seconds and SE
1 foot at 9 seconds. A chance of showers and tstms, mainly in the
morning.
.SUN NIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 ft.
A slight chance of showers and tstms after midnight.
.MON...SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.MON NIGHT...S 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 slight chance of showers
and tstms.
.TUE NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of
showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ384-211300-
Waters from Savannah GA to Altamaha Sound GA extending from 20 to
60 NM-
745 PM EDT Thu Aug 20 2026

.TONIGHT...S winds 10 to 15 kt, becoming SW late. Seas 2 to 3 ft.
Wave Detail: S 2 ft at 4 seconds and SE 2 ft at 8 seconds.
.FRI...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft
at 4 seconds and SE 2 ft at 8 seconds.
.FRI NIGHT...S winds 15 to 20 kt, becoming SW 10 to 15 kt after
midnight. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds and SE
1 foot at 8 seconds. A chance of showers and tstms.
.SAT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 4 seconds and SE 1 foot at 8 seconds. A slight chance of
tstms. A slight chance of showers in the morning, then a chance
of showers in the afternoon.
.SAT NIGHT...SW winds 15 kt with gusts to 20 kt. Seas 3 to 4 ft.
Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 9 seconds. A
chance of showers and tstms.
.SUN...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 5 seconds and SE 1 foot at 9 seconds. Showers likely with a
chance of tstms in the morning.
.SUN NIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 2 to
3 ft.
.MON...SW winds 5 to 10 kt. Seas 2 to 3 ft.
.MON NIGHT...S winds 10 to 15 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...S winds 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.

Winds and seas higher in and near tstms.

$$