790
FZUS52 KCHS 172139
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
539 PM EDT Thu Sep 17 2026

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

AMZ300-181100-
539 PM EDT Thu Sep 17 2026

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
High pressure will persist across the area through the end of the
week. A surface trough will approach from the north late in the
weekend and linger into early next week.

$$

AMZ340-181100-
Charleston Harbor-
539 PM EDT Thu Sep 17 2026

.TONIGHT...E winds 5 to 10 kt, diminishing to 5 kt after
midnight, then becoming light and variable late.
.FRI...N winds 5 kt, becoming SE in the afternoon.
.FRI NIGHT...SW winds 5 kt. A chance of showers after midnight.
.SAT...N winds 5 kt, becoming SE in the afternoon. A chance of
showers and tstms in the afternoon.
.SAT NIGHT...E winds 5 to 10 kt. A chance of showers and tstms,
mainly in the evening.
.SUN...E winds 5 to 10 kt. A chance of showers. A slight chance
of tstms in the morning, then a chance of tstms in the afternoon.
.SUN NIGHT...E winds 5 kt. A chance of showers and tstms, mainly
in the evening.
.MON...NE winds 5 kt. A chance of showers and tstms.
.MON NIGHT...E winds 5 kt. A chance of showers and tstms.
.TUE...NE winds 5 to 10 kt. Showers likely with a chance of
tstms.
.TUE NIGHT...NE winds 5 to 10 kt. A chance of showers with a
slight chance of tstms.

Winds and waves higher in and near tstms.

Unless otherwise noted, waves 1 foot or less.

Charleston Harbor water temperature 84 degrees.

$$

AMZ360-181100-
Coastal waters from South Santee River to Edisto Beach SC out
20 NM-
539 PM EDT Thu Sep 17 2026

.TONIGHT...E winds 5 to 10 kt, becoming NE late. Seas 3 to 4 ft,
subsiding to 2 to 3 ft after midnight. Wave Detail: E 3 ft at
7 seconds, becoming E 3 ft at 7 seconds and E 1 foot at
13 seconds.
.FRI...N winds 5 kt, becoming S in the afternoon. Seas 2 to 3 ft.
Wave Detail: E 3 ft at 7 seconds and E 1 foot at 13 seconds.
.FRI NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
2 ft. Wave Detail: E 2 ft at 7 seconds and E 1 foot at
12 seconds. A slight chance of showers after midnight.
.SAT...NW winds 5 kt, becoming E in the afternoon. Seas 2 ft.
Wave Detail: E 2 ft at 7 seconds and E 1 foot at 12 seconds. A
slight chance of showers and tstms in the afternoon.
.SAT NIGHT...E winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft
at 7 seconds and SE 2 ft at 12 seconds. A slight chance of tstms.
A slight chance of showers in the evening, then a chance of
showers after midnight.
.SUN...E winds 5 to 10 kt. Seas 2 ft. Wave Detail: SE 2 ft at
11 seconds and E 1 foot at 7 seconds. A chance of showers. A
chance of tstms, mainly in the morning.
.SUN NIGHT...E winds 5 to 10 kt, diminishing to 5 kt after
midnight. Seas 2 ft. A slight chance of showers and tstms in the
evening, then a chance of showers and tstms after midnight.
.MON...E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.MON NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely
with a chance of tstms.
.TUE...NE winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a
chance of tstms.
.TUE NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely
with a chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ362-181100-
Coastal waters from Edisto Beach SC to Savannah GA out 20 NM-
539 PM EDT Thu Sep 17 2026

.TONIGHT...E winds 10 to 15 kt, diminishing to 5 to 10 kt late
this evening. Seas 3 to 4 ft. Wave Detail: E 4 ft at 7 seconds.
.FRI...N winds 5 to 10 kt, becoming E in the afternoon. Seas 2 to
3 ft. Wave Detail: E 3 ft at 7 seconds.
.FRI NIGHT...S winds 5 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at
7 seconds and SE 1 foot at 12 seconds.
.SAT...N winds 5 kt, becoming E in the afternoon. Seas 2 ft. Wave
Detail: E 2 ft at 6 seconds and SE 1 foot at 12 seconds. A slight
chance of showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas 2 ft. Wave Detail: SE 2 ft
at 7 seconds and SE 1 foot at 12 seconds. A slight chance of
tstms. A slight chance of showers in the evening, then a chance
of showers after midnight.
.SUN...E winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft at
7 seconds and SE 2 ft at 11 seconds. A chance of showers. A
chance of tstms, mainly in the morning.
.SUN NIGHT...E winds 5 kt. Seas 2 ft. A slight chance of showers
and tstms in the evening, then a chance of showers and tstms
after midnight.
.MON...NE winds 5 kt. Seas 2 ft. A chance of showers and tstms.
.MON NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely
with a chance of tstms.
.TUE...NE winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a
chance of tstms.
.TUE NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely
with a chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ364-181100-
Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm,
including Grays Reef National Marine Sanctuary-
539 PM EDT Thu Sep 17 2026

.TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt, diminishing
to 5 to 10 kt after midnight. Seas 3 to 4 ft. Wave Detail: NE
4 ft at 7 seconds.
.FRI...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 7 seconds.
.FRI NIGHT...SE winds 5 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 7 seconds.
.SAT...N winds 5 kt, becoming E in the afternoon. Seas 2 ft. Wave
Detail: E 2 ft at 7 seconds.
.SAT NIGHT...SE winds 5 to 10 kt. Seas 2 ft. Wave Detail: SE 2 ft
at 7 seconds. A chance of showers with a slight chance of tstms
after midnight.
.SUN...NE winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft at
8 seconds and SE 2 ft at 11 seconds. A chance of showers and
tstms.
.SUN NIGHT...E winds 5 to 10 kt, diminishing to 5 kt after
midnight. Seas 2 ft. A slight chance of showers and tstms in the
evening, then a chance of showers and tstms after midnight.
.MON...NE winds 5 to 10 kt. Seas 2 ft. Showers likely with a
chance of tstms.
.MON NIGHT...E winds 5 to 10 kt. Seas 2 ft. A chance of showers
and tstms.
.TUE...NE winds 5 to 10 kt. Seas 2 ft. Showers likely with a
chance of tstms.
.TUE NIGHT...NE winds 5 to 10 kt. Seas 2 ft. A chance of showers
and tstms.

Winds and seas higher in and near tstms.

$$

AMZ380-181100-
Waters from South Santee River SC to Edisto Beach SC extending
from 20 to 60 NM-
539 PM EDT Thu Sep 17 2026

.TONIGHT...NE winds 10 to 15 kt, becoming E 5 to 10 kt after
midnight. Seas 3 to 4 ft. Wave Detail: E 4 ft at 7 seconds and E
1 foot at 13 seconds.
.FRI...NE winds 5 to 10 kt, diminishing to 5 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and E 1 foot at
13 seconds.
.FRI NIGHT...SE winds 5 kt, becoming SW after midnight. Seas 2 to
3 ft. Wave Detail: E 2 ft at 7 seconds and E 1 foot at
12 seconds.
.SAT...N winds 5 kt, becoming E in the afternoon. Seas 2 ft. Wave
Detail: E 2 ft at 8 seconds and SE 2 ft at 12 seconds.
.SAT NIGHT...E winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft
at 7 seconds and SE 2 ft at 11 seconds. A slight chance of
showers and tstms in the evening, then a chance of showers and
tstms after midnight.
.SUN...NE winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft at
7 seconds and SE 2 ft at 11 seconds. A chance of showers and
tstms.
.SUN NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance
of showers and tstms in the evening, then a chance of showers and
tstms after midnight.
.MON...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a
chance of tstms.
.MON NIGHT...E winds 5 to 10 kt. Seas 3 ft. Showers likely with a
chance of tstms.
.TUE...NE winds 5 to 10 kt. Seas 3 ft. Showers likely with a
slight chance of tstms.
.TUE NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely
with a chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ382-181100-
Waters from Edisto Beach SC to Savannah GA extending from 20 to
60 NM-
539 PM EDT Thu Sep 17 2026

.TONIGHT...NE winds 10 to 15 kt, diminishing to 5 to 10 kt after
midnight. Seas 3 to 4 ft. Wave Detail: NE 4 ft at 7 seconds and E
1 foot at 13 seconds.
.FRI...NE winds 5 to 10 kt. Seas 3 ft. Wave Detail: E 3 ft at
7 seconds and SE 1 foot at 13 seconds.
.FRI NIGHT...SE winds 5 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 7 seconds and E 1 foot at 12 seconds.
.SAT...NE winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft at
7 seconds and SE 1 foot at 12 seconds.
.SAT NIGHT...E winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft
at 8 seconds and SE 2 ft at 11 seconds. A slight chance of
showers and tstms in the evening, then a chance of showers and
tstms after midnight.
.SUN...NE winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft at
7 seconds and SE 2 ft at 11 seconds. A chance of showers and
tstms.
.SUN NIGHT...E winds 5 to 10 kt. Seas 2 ft. A chance of showers
and tstms.
.MON...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a
chance of tstms.
.MON NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely
with a chance of tstms.
.TUE...NE winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a
slight chance of tstms.
.TUE NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely
with a chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ384-181100-
Waters from Savannah GA to Altamaha Sound GA extending from 20 to
60 NM-
539 PM EDT Thu Sep 17 2026

.TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Seas 4 to
5 ft, subsiding to 3 to 4 ft after midnight. Wave Detail: NE 5 ft
at 7 seconds, becoming E 4 ft at 8 seconds.
.FRI...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft
at 8 seconds.
.FRI NIGHT...E winds 5 to 10 kt, becoming SE after midnight. Seas
2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and SE 1 foot at
12 seconds.
.SAT...NE winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft at
7 seconds and SE 1 foot at 12 seconds.
.SAT NIGHT...E winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft
at 8 seconds and SE 2 ft at 11 seconds. A chance of showers with
a slight chance of tstms after midnight.
.SUN...NE winds 5 to 10 kt. Seas 2 ft. Wave Detail: E 2 ft at
8 seconds and SE 2 ft at 11 seconds. A chance of showers and
tstms.
.SUN NIGHT...E winds 5 to 10 kt. Seas 2 ft. A chance of showers
and tstms.
.MON...NE winds 5 to 10 kt. Seas 2 ft. Showers likely with a
chance of tstms.
.MON NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers and tstms.
.TUE...NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.TUE NIGHT...NE winds 5 to 10 kt. Seas 2 ft. Showers likely with
a chance of tstms.

Winds and seas higher in and near tstms.

$$