307
FZUS52 KCHS 210939
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
539 AM EDT Fri Aug 21 2026

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

AMZ300-212300-
539 AM EDT Fri Aug 21 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.

$$

AMZ340-212300-
Charleston Harbor-
539 AM EDT Fri Aug 21 2026

.TODAY...SW winds 5 to 10 kt, becoming S 10 to 15 kt late. A
slight chance of showers and tstms early this afternoon.
.TONIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt after
midnight. 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 10 to 15 kt, diminishing to 5 to 10 kt
after midnight. Showers likely with a chance of tstms.
.SUN...SW winds 5 to 10 kt. A slight chance of showers and tstms
in the morning.
.SUN NIGHT...SW winds 5 to 10 kt.
.MON...S winds 5 to 10 kt.
.MON NIGHT...S winds 5 to 10 kt.
.TUE...S 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 88 degrees.

$$

AMZ360-212300-
Coastal waters from South Santee River to Edisto Beach SC out
20 NM-
539 AM EDT Fri Aug 21 2026

.TODAY...SW winds 5 to 10 kt, becoming S 10 to 15 kt late. Seas
2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and SE 2 ft at
8 seconds.
.TONIGHT...S winds 10 to 15 kt with gusts to 20 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 4 seconds and SE 1 foot at
8 seconds. A chance of showers and tstms.
.SAT...SW winds 10 to 15 kt. Seas 3 ft. Wave Detail: S 3 ft at
5 seconds and E 1 foot at 9 seconds. A chance of tstms. A chance
of showers.
.SAT NIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 to
4 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 with gusts to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: S 3 ft at 5 seconds and E 1 foot at 8 seconds. A slight
chance of showers and tstms.
.MON...S winds 5 to 10 kt. Seas 2 to 3 ft.
.MON NIGHT...S winds 5 to 10 kt. Seas 2 ft. A slight chance of
showers and tstms.
.TUE...S winds 5 to 10 kt. Seas 2 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.

$$

AMZ362-212300-
Coastal waters from Edisto Beach SC to Savannah GA out 20 NM-
539 AM EDT Fri Aug 21 2026

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

Winds and seas higher in and near tstms.

$$

AMZ364-212300-
Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm,
including Grays Reef National Marine Sanctuary-
539 AM EDT Fri Aug 21 2026

.TODAY...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts
to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at
4 seconds and SE 1 foot at 8 seconds.
.TONIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 4 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 5 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. A chance of showers in the morning.
.SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 4 seconds and E 1 foot at 8 seconds.
.MON...SW winds 5 to 10 kt. Seas 2 ft.
.MON NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft.
.TUE...S winds 10 to 15 kt. Seas 2 ft. A 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.

$$

AMZ380-212300-
Waters from South Santee River SC to Edisto Beach SC extending
from 20 to 60 NM-
539 AM EDT Fri Aug 21 2026

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

$$

AMZ382-212300-
Waters from Edisto Beach SC to Savannah GA extending from 20 to
60 NM-
539 AM EDT Fri Aug 21 2026

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

$$

AMZ384-212300-
Waters from Savannah GA to Altamaha Sound GA extending from 20 to
60 NM-
539 AM EDT Fri Aug 21 2026

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

$$