584
FZUS52 KCHS 200939
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
539 AM 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

AMZ300-202300-
539 AM 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.

$$

AMZ340-202300-
Charleston Harbor-
539 AM EDT Thu Aug 20 2026

.TODAY...S winds 5 kt, becoming SE this afternoon. A slight
chance of showers and tstms this afternoon.
.TONIGHT...S winds 5 to 10 kt.
.FRI...SW winds 5 to 10 kt, becoming S 10 to 15 kt in the
afternoon. A chance of showers and tstms in the afternoon.
.FRI NIGHT...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. A chance of showers and tstms in the
morning, then showers and tstms likely in the afternoon.
.SAT NIGHT...SW winds 5 to 10 kt. Showers and tstms likely,
mainly in the evening.
.SUN...SW winds 5 to 10 kt. A slight chance of showers and tstms.
.SUN NIGHT...SW winds 5 to 10 kt.
.MON...SW winds 5 to 10 kt. A slight chance of showers and tstms.
.MON NIGHT...S winds 5 to 10 kt. A slight 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.

$$

AMZ360-202300-
Coastal waters from South Santee River to Edisto Beach SC out
20 NM-
539 AM EDT Thu Aug 20 2026

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

Winds and seas higher in and near tstms.

$$

AMZ362-202300-
Coastal waters from Edisto Beach SC to Savannah GA out 20 NM-
539 AM EDT Thu Aug 20 2026

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

Winds and seas higher in and near tstms.

$$

AMZ364-202300-
Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm,
including Grays Reef National Marine Sanctuary-
539 AM EDT Thu Aug 20 2026

.TODAY...W winds 5 to 10 kt, diminishing to 5 kt late this
morning, then becoming S this afternoon. Seas 2 ft. Wave Detail:
SE 2 ft at 9 seconds and S 1 foot at 4 seconds.
.TONIGHT...S winds 10 to 15 kt. Seas 2 ft. Wave Detail: S 2 ft at
4 seconds and SE 1 foot at 9 seconds.
.FRI...SW winds 5 to 10 kt, becoming S 10 to 15 kt in the
afternoon. 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 afternoon.
.FRI 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.
.SAT...SW winds 10 to 15 kt. Seas 2 ft. Wave Detail: S 2 ft at
5 seconds and SE 1 foot at 9 seconds. A chance of showers and
tstms.
.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...SW winds 10 to 15 kt. Seas 2 ft. A slight chance of
showers and tstms.
.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 10 to 15 kt. Seas 2 to 3 ft. A slight chance
of showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ380-202300-
Waters from South Santee River SC to Edisto Beach SC extending
from 20 to 60 NM-
539 AM EDT Thu Aug 20 2026

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

$$

AMZ382-202300-
Waters from Edisto Beach SC to Savannah GA extending from 20 to
60 NM-
539 AM EDT Thu Aug 20 2026

.TODAY...S winds 5 to 10 kt. Seas 2 ft. Wave Detail: SE 2 ft at
9 seconds and SW 1 foot at 3 seconds.
.TONIGHT...S winds 10 to 15 kt. 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. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 4 seconds and SE 2 ft at 9 seconds.
.FRI 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 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: S 3 ft
at 5 seconds and SE 2 ft at 9 seconds. A chance of showers and
tstms.
.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 10 seconds.
Showers likely with a chance of tstms.
.SUN...SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers
and tstms.
.SUN NIGHT...SW winds 10 to 15 kt. Seas 3 ft. A slight chance of
showers and tstms.
.MON...SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of
showers and tstms.
.MON NIGHT...S winds 10 to 15 kt. Seas 3 ft. A slight chance of
showers and tstms.

Winds and seas higher in and near tstms.

$$

AMZ384-202300-
Waters from Savannah GA to Altamaha Sound GA extending from 20 to
60 NM-
539 AM EDT Thu Aug 20 2026

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

Winds and seas higher in and near tstms.

$$