FZUS52 KCHS 172140
CWFCHS
Coastal Waters Forecast
National Weather Service Charleston SC
439 PM EST Wed Dec 17 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
AMZ300-181000-
439 PM EST Wed Dec 17 2025
.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
High pressure will weaken and shift out of the area on Thursday
ahead of an approaching cold front. The cold front is expected to
move through the area Friday morning and high pressure will
return through the weekend. Another cold front will move through
from the north on Monday, followed by high pressure across the
region into the middle of next week.
$$
AMZ330-181000-
Charleston Harbor-
439 PM EST Wed Dec 17 2025
.TONIGHT...E winds 5 kt, becoming 5 kt after midnight. A slight
chance of rain late.
.THU...E winds 5 to 10 kt, becoming SE in the afternoon. A slight
chance of rain in the morning, then rain with a slight chance of
tstms in the afternoon.
.THU NIGHT...S winds 5 to 10 kt, becoming SW 15 kt with gusts to
20 kt after midnight. A slight chance of tstms. Rain, mainly in
the evening.
.FRI...W winds 10 to 15 kt.
.FRI NIGHT...NW winds 5 kt.
.SAT...NE winds 5 kt.
.SAT NIGHT...E winds 5 kt, becoming W after midnight.
.SUN...W winds 5 kt.
.SUN NIGHT...N winds 5 to 10 kt.
.MON...NE winds 10 to 15 kt.
.MON NIGHT...NE winds 5 to 10 kt.
Winds and waves higher in and near tstms.
Unless otherwise noted, waves 1 foot or less.
Charleston Harbor water temperature 53 degrees.
$$
AMZ350-181000-
Waters from South Santee River to Edisto Beach SC out 20 NM-
439 PM EST Wed Dec 17 2025
.TONIGHT...E winds 5 kt, increasing to 5 to 10 kt late. Seas 2 to
3 ft. Wave Detail: SE 2 ft at 10 seconds and S 1 foot at
4 seconds. A slight chance of rain after midnight.
.THU...SE winds 10 to 15 kt. Seas 3 to 4 ft, building to 4 to
5 ft in the afternoon. Wave Detail: SE 3 ft at 5 seconds and SE
3 ft at 9 seconds, becoming SE 5 ft at 9 seconds. A slight chance
of rain in the morning, then rain with a slight chance of tstms
in the afternoon.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 20 to 25 kt after
midnight. Seas 4 to 6 ft, building to 5 to 7 ft after midnight.
Wave Detail: SE 5 ft at 7 seconds, becoming SE 7 ft at 8 seconds.
Rain with a chance of tstms in the evening, then rain likely with
a slight chance of tstms after midnight.
.FRI...W winds 20 to 25 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the
afternoon. Wave Detail: S 7 ft at 9 seconds and SW 3 ft at
5 seconds, becoming SE 6 ft at 9 seconds and SW 4 ft at
7 seconds. A slight chance of rain in the morning.
.FRI NIGHT...NW winds 10 kt, becoming N after midnight. Seas 4 to
5 ft, subsiding to 3 to 4 ft after midnight. Wave Detail: SE 4 ft
at 8 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 ft. Wave Detail: NE 3 ft at
8 seconds.
.SAT NIGHT...E winds 5 kt, becoming W after midnight. Seas 2 to
3 ft.
.SUN...W winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 3 to 4 ft.
.MON...NE winds 15 to 20 kt. Seas 4 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
Winds and seas higher in and near tstms.
$$
AMZ352-181000-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
439 PM EST Wed Dec 17 2025
.TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 10 seconds. A slight chance of rain after midnight.
.THU...E winds 10 kt, becoming SE in the afternoon. Seas 2 to
3 ft, building to 3 to 4 ft in the afternoon. Wave Detail: SE
3 ft at 10 seconds, becoming SE 4 ft at 7 seconds. A slight
chance of tstms. A chance of rain in the morning, then rain in
the afternoon.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt with
gusts to 25 kt after midnight. Seas 4 to 5 ft, building to 4 to
6 ft after midnight. Wave Detail: SE 5 ft at 7 seconds, becoming
SE 6 ft at 8 seconds. Rain with a chance of tstms in the evening,
then rain likely with a slight chance of tstms after midnight.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 5 to 6 ft, subsiding to 4 to 6 ft in the
afternoon. Wave Detail: SE 6 ft at 8 seconds, becoming SE 5 ft at
8 seconds. A slight chance of rain in the morning.
.FRI NIGHT...NW winds 10 kt, becoming N after midnight. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 8 seconds and W 1 foot at
3 seconds.
.SAT...NE winds 10 kt, diminishing to 5 kt in the afternoon. Seas
2 to 3 ft. Wave Detail: E 3 ft at 9 seconds.
.SAT NIGHT...NE winds 5 kt, becoming W after midnight. Seas 2 to
3 ft.
.SUN...W winds 5 kt. Seas 2 to 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 3 to 4 ft.
.MON...NE winds 15 to 20 kt. Seas 4 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
Winds and seas higher in and near tstms.
$$
AMZ354-181000-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
439 PM EST Wed Dec 17 2025
.TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 10 seconds. A slight chance of rain late this evening. A
chance of rain after midnight. Vsby 1 to 3 NM late.
.THU...SE winds 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at
8 seconds. A slight chance of tstms. A chance of rain in the
morning, then rain likely in the afternoon. Vsby 1 to 3 NM in the
morning.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after
midnight. Seas 3 to 4 ft, building to 4 to 5 ft after midnight.
Wave Detail: SE 4 ft at 8 seconds, becoming SE 5 ft at 8 seconds.
A slight chance of tstms. Rain.
.FRI...W winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: SE 5 ft
at 8 seconds and W 1 foot at 3 seconds. A slight chance of rain
in the morning.
.FRI NIGHT...NW winds 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft
at 9 seconds and NW 2 ft at 3 seconds.
.SAT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft
at 9 seconds.
.SAT NIGHT...Variable winds 5 kt. Seas 2 to 3 ft.
.SUN...W winds 5 kt. Seas 2 to 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 3 to 4 ft.
.MON...NE winds 20 kt. Seas 4 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
Winds and seas higher in and near tstms.
$$
AMZ374-181000-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
439 PM EST Wed Dec 17 2025
.TONIGHT...E winds 5 to 10 kt, becoming 10 kt late. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 9 seconds. A slight chance of rain
late this evening. A chance of rain after midnight, then a slight
chance of rain late.
.THU...SE winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft.
Wave Detail: SE 5 ft at 7 seconds. A slight chance of tstms.
Rain.
.THU NIGHT...SW winds 15 to 20 kt with gusts to 30 kt. Seas 4 to
6 ft, building to 5 to 7 ft after midnight. Wave Detail: SE 6 ft
at 8 seconds. A chance of tstms. Rain.
.FRI...W winds 15 to 20 kt. Gusts to 30 kt in the morning. Seas
5 to 7 ft, subsiding to 4 to 6 ft in the afternoon. Wave Detail:
SE 6 ft at 8 seconds and SW 4 ft at 5 seconds, becoming SE 5 ft
at 8 seconds and W 4 ft at 5 seconds. A slight chance of rain in
the morning.
.FRI NIGHT...NW winds 10 to 15 kt with gusts to 20 kt, becoming N
after midnight. Seas 4 to 5 ft. Wave Detail: SE 4 ft at 9 seconds
and NW 3 ft at 4 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: NE 4 ft
at 9 seconds and N 2 ft at 3 seconds.
.SAT NIGHT...W winds 5 to 10 kt. Seas 3 ft.
.SUN...NW winds 5 to 10 kt. Seas 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 4 to 5 ft.
.MON...NE winds 20 kt. Seas 5 to 7 ft. A slight chance of rain.
.MON NIGHT...NE winds 15 to 20 kt. Seas 5 to 7 ft. A slight
chance of rain.
Winds and seas higher in and near tstms.
$$
CWFCHS
Coastal Waters Forecast
National Weather Service Charleston SC
439 PM EST Wed Dec 17 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
AMZ300-181000-
439 PM EST Wed Dec 17 2025
.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
High pressure will weaken and shift out of the area on Thursday
ahead of an approaching cold front. The cold front is expected to
move through the area Friday morning and high pressure will
return through the weekend. Another cold front will move through
from the north on Monday, followed by high pressure across the
region into the middle of next week.
$$
AMZ330-181000-
Charleston Harbor-
439 PM EST Wed Dec 17 2025
.TONIGHT...E winds 5 kt, becoming 5 kt after midnight. A slight
chance of rain late.
.THU...E winds 5 to 10 kt, becoming SE in the afternoon. A slight
chance of rain in the morning, then rain with a slight chance of
tstms in the afternoon.
.THU NIGHT...S winds 5 to 10 kt, becoming SW 15 kt with gusts to
20 kt after midnight. A slight chance of tstms. Rain, mainly in
the evening.
.FRI...W winds 10 to 15 kt.
.FRI NIGHT...NW winds 5 kt.
.SAT...NE winds 5 kt.
.SAT NIGHT...E winds 5 kt, becoming W after midnight.
.SUN...W winds 5 kt.
.SUN NIGHT...N winds 5 to 10 kt.
.MON...NE winds 10 to 15 kt.
.MON NIGHT...NE winds 5 to 10 kt.
Winds and waves higher in and near tstms.
Unless otherwise noted, waves 1 foot or less.
Charleston Harbor water temperature 53 degrees.
$$
AMZ350-181000-
Waters from South Santee River to Edisto Beach SC out 20 NM-
439 PM EST Wed Dec 17 2025
.TONIGHT...E winds 5 kt, increasing to 5 to 10 kt late. Seas 2 to
3 ft. Wave Detail: SE 2 ft at 10 seconds and S 1 foot at
4 seconds. A slight chance of rain after midnight.
.THU...SE winds 10 to 15 kt. Seas 3 to 4 ft, building to 4 to
5 ft in the afternoon. Wave Detail: SE 3 ft at 5 seconds and SE
3 ft at 9 seconds, becoming SE 5 ft at 9 seconds. A slight chance
of rain in the morning, then rain with a slight chance of tstms
in the afternoon.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 20 to 25 kt after
midnight. Seas 4 to 6 ft, building to 5 to 7 ft after midnight.
Wave Detail: SE 5 ft at 7 seconds, becoming SE 7 ft at 8 seconds.
Rain with a chance of tstms in the evening, then rain likely with
a slight chance of tstms after midnight.
.FRI...W winds 20 to 25 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the
afternoon. Wave Detail: S 7 ft at 9 seconds and SW 3 ft at
5 seconds, becoming SE 6 ft at 9 seconds and SW 4 ft at
7 seconds. A slight chance of rain in the morning.
.FRI NIGHT...NW winds 10 kt, becoming N after midnight. Seas 4 to
5 ft, subsiding to 3 to 4 ft after midnight. Wave Detail: SE 4 ft
at 8 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 ft. Wave Detail: NE 3 ft at
8 seconds.
.SAT NIGHT...E winds 5 kt, becoming W after midnight. Seas 2 to
3 ft.
.SUN...W winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 3 to 4 ft.
.MON...NE winds 15 to 20 kt. Seas 4 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
Winds and seas higher in and near tstms.
$$
AMZ352-181000-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
439 PM EST Wed Dec 17 2025
.TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 10 seconds. A slight chance of rain after midnight.
.THU...E winds 10 kt, becoming SE in the afternoon. Seas 2 to
3 ft, building to 3 to 4 ft in the afternoon. Wave Detail: SE
3 ft at 10 seconds, becoming SE 4 ft at 7 seconds. A slight
chance of tstms. A chance of rain in the morning, then rain in
the afternoon.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt with
gusts to 25 kt after midnight. Seas 4 to 5 ft, building to 4 to
6 ft after midnight. Wave Detail: SE 5 ft at 7 seconds, becoming
SE 6 ft at 8 seconds. Rain with a chance of tstms in the evening,
then rain likely with a slight chance of tstms after midnight.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 5 to 6 ft, subsiding to 4 to 6 ft in the
afternoon. Wave Detail: SE 6 ft at 8 seconds, becoming SE 5 ft at
8 seconds. A slight chance of rain in the morning.
.FRI NIGHT...NW winds 10 kt, becoming N after midnight. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 8 seconds and W 1 foot at
3 seconds.
.SAT...NE winds 10 kt, diminishing to 5 kt in the afternoon. Seas
2 to 3 ft. Wave Detail: E 3 ft at 9 seconds.
.SAT NIGHT...NE winds 5 kt, becoming W after midnight. Seas 2 to
3 ft.
.SUN...W winds 5 kt. Seas 2 to 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 3 to 4 ft.
.MON...NE winds 15 to 20 kt. Seas 4 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
Winds and seas higher in and near tstms.
$$
AMZ354-181000-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
439 PM EST Wed Dec 17 2025
.TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 10 seconds. A slight chance of rain late this evening. A
chance of rain after midnight. Vsby 1 to 3 NM late.
.THU...SE winds 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at
8 seconds. A slight chance of tstms. A chance of rain in the
morning, then rain likely in the afternoon. Vsby 1 to 3 NM in the
morning.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after
midnight. Seas 3 to 4 ft, building to 4 to 5 ft after midnight.
Wave Detail: SE 4 ft at 8 seconds, becoming SE 5 ft at 8 seconds.
A slight chance of tstms. Rain.
.FRI...W winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: SE 5 ft
at 8 seconds and W 1 foot at 3 seconds. A slight chance of rain
in the morning.
.FRI NIGHT...NW winds 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft
at 9 seconds and NW 2 ft at 3 seconds.
.SAT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft
at 9 seconds.
.SAT NIGHT...Variable winds 5 kt. Seas 2 to 3 ft.
.SUN...W winds 5 kt. Seas 2 to 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 3 to 4 ft.
.MON...NE winds 20 kt. Seas 4 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
Winds and seas higher in and near tstms.
$$
AMZ374-181000-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
439 PM EST Wed Dec 17 2025
.TONIGHT...E winds 5 to 10 kt, becoming 10 kt late. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 9 seconds. A slight chance of rain
late this evening. A chance of rain after midnight, then a slight
chance of rain late.
.THU...SE winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft.
Wave Detail: SE 5 ft at 7 seconds. A slight chance of tstms.
Rain.
.THU NIGHT...SW winds 15 to 20 kt with gusts to 30 kt. Seas 4 to
6 ft, building to 5 to 7 ft after midnight. Wave Detail: SE 6 ft
at 8 seconds. A chance of tstms. Rain.
.FRI...W winds 15 to 20 kt. Gusts to 30 kt in the morning. Seas
5 to 7 ft, subsiding to 4 to 6 ft in the afternoon. Wave Detail:
SE 6 ft at 8 seconds and SW 4 ft at 5 seconds, becoming SE 5 ft
at 8 seconds and W 4 ft at 5 seconds. A slight chance of rain in
the morning.
.FRI NIGHT...NW winds 10 to 15 kt with gusts to 20 kt, becoming N
after midnight. Seas 4 to 5 ft. Wave Detail: SE 4 ft at 9 seconds
and NW 3 ft at 4 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: NE 4 ft
at 9 seconds and N 2 ft at 3 seconds.
.SAT NIGHT...W winds 5 to 10 kt. Seas 3 ft.
.SUN...NW winds 5 to 10 kt. Seas 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 4 to 5 ft.
.MON...NE winds 20 kt. Seas 5 to 7 ft. A slight chance of rain.
.MON NIGHT...NE winds 15 to 20 kt. Seas 5 to 7 ft. A slight
chance of rain.
Winds and seas higher in and near tstms.
$$