FZUS52 KCHS 170520
CWFCHS
Coastal Waters Forecast
National Weather Service Charleston SC
1219 AM 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
AMZ300-171800-
1219 AM EST Wed Dec 17 2025
.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
High pressure will prevail through Thursday before a cold front
pushes offshore Friday morning. High pressure returns during the
weekend, followed by another cold front arriving early next week.
$$
AMZ330-171800-
Charleston Harbor-
1220 AM EST Wed Dec 17 2025
.REST OF TONIGHT...Light and variable winds, becoming NW 5 kt
late.
.WED...NW winds 5 kt, becoming SW in the afternoon.
.WED NIGHT...E winds 5 kt. A chance of rain after midnight.
.THU...E winds 5 kt, becoming S in the afternoon. A chance of
showers in the morning, then showers with a chance of tstms in
the afternoon.
.THU NIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt with
gusts to 20 kt after midnight. Showers with a chance of tstms in
the evening, then a chance of showers after midnight.
.FRI...W winds 10 to 15 kt. A slight chance of showers in the
morning.
.FRI NIGHT...NW winds 5 kt.
.SAT...E winds 5 kt.
.SAT NIGHT...SW winds 5 kt.
.SUN...W winds 5 kt.
.SUN NIGHT...N winds 5 to 10 kt.
Winds and waves higher in and near tstms.
Unless otherwise noted, waves 1 foot or less.
Charleston Harbor water temperature 53 degrees.
$$
AMZ350-171800-
Waters from South Santee River to Edisto Beach SC out 20 NM-
1220 AM EST Wed Dec 17 2025
.REST OF TONIGHT...W winds 5 kt. Seas 2 to 3 ft. Wave Detail: E
2 ft at 10 seconds.
.WED...NW winds 5 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at
10 seconds.
.WED NIGHT...E winds 5 kt, increasing to 5 to 10 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 10 seconds and
SE 1 foot at 4 seconds. A slight chance of rain after midnight.
.THU...SE winds 5 to 10 kt, becoming S in the afternoon. Seas
2 to 3 ft, building to 3 to 4 ft in the afternoon. Wave Detail:
SE 3 ft at 5 seconds and SE 2 ft at 9 seconds, becoming SE 4 ft
at 9 seconds and SE 3 ft at 5 seconds. Showers likely in the
morning, then showers with a chance of tstms in the afternoon.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 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.
Showers with a chance of tstms in the evening, then showers
likely after midnight.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 5 to 7 ft. Wave Detail: SE 7 ft at 9 seconds and
SW 4 ft at 8 seconds. A slight chance of showers in the morning.
.FRI NIGHT...NW winds 5 to 10 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight.
.SAT...NE winds 5 to 10 kt. Seas 2 to 3 ft.
.SAT NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN...W winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN NIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft.
Winds and seas higher in and near tstms.
$$
AMZ352-171800-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
1220 AM EST Wed Dec 17 2025
.REST OF TONIGHT...NE winds 5 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 9 seconds.
.WED...N winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
10 seconds.
.WED NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 10 seconds. A chance of rain after midnight.
.THU...SE winds 10 kt, becoming S in the afternoon. Seas 2 to
3 ft, building to 3 to 4 ft in the afternoon. Wave Detail: SE
3 ft at 10 seconds, becoming SE 4 ft at 7 seconds. Showers. A
chance of tstms in the afternoon.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after
midnight. Seas 3 to 4 ft, building to 4 to 5 ft after midnight.
Wave Detail: SE 4 ft at 7 seconds, becoming SE 5 ft at 7 seconds.
Showers with a chance of tstms in the evening, then a chance of
showers after midnight.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 5 to 6 ft, subsiding to 4 to 6 ft in the
afternoon. Wave Detail: SE 5 ft at 8 seconds. A slight chance of
showers in the morning.
.FRI NIGHT...NW winds 5 to 10 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight.
.SAT...NE winds 5 to 10 kt. Seas 2 to 3 ft.
.SAT NIGHT...W winds 5 kt. Seas 2 ft.
.SUN...W winds 5 kt. Seas 2 ft.
.SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft.
Winds and seas higher in and near tstms.
$$
AMZ354-171800-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
1220 AM EST Wed Dec 17 2025
.REST OF TONIGHT...NE winds 5 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 9 seconds.
.WED...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 10 seconds.
.WED NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 10 seconds. A chance of rain with a slight chance of
tstms after midnight.
.THU...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 10 seconds. Showers. A chance of tstms in the afternoon.
.THU NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft, building to
4 to 5 ft after midnight. Wave Detail: SE 4 ft at 9 seconds,
becoming SE 5 ft at 9 seconds. Showers with a chance of tstms in
the evening, then a chance of showers after midnight.
.FRI...W winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft.
Wave Detail: SE 5 ft at 8 seconds and W 2 ft at 3 seconds. A
slight chance of showers in the morning.
.FRI NIGHT...NW winds 10 kt. Seas 3 to 4 ft.
.SAT...NE winds 5 to 10 kt. Seas 2 to 3 ft.
.SAT NIGHT...SW winds 5 kt. Seas 2 ft.
.SUN...W winds 5 kt. Seas 2 ft.
.SUN NIGHT...NW winds 5 to 10 kt. Seas 2 ft.
Winds and seas higher in and near tstms.
$$
AMZ374-171800-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
1220 AM EST Wed Dec 17 2025
.REST OF TONIGHT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: E 4 ft at 9 seconds.
.WED...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft
at 9 seconds. A slight chance of rain in the afternoon.
.WED NIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 9 seconds. A slight chance of rain in the evening, then a
chance of rain with a slight chance of tstms after midnight.
.THU...S winds 10 kt. Seas 4 to 5 ft. Wave Detail: SE 5 ft at
8 seconds. Showers. A slight chance of tstms in the morning, then
a chance of tstms in the afternoon.
.THU NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to
6 ft, building to 5 to 7 ft after midnight. Wave Detail: SE 5 ft
at 8 seconds, becoming SE 6 ft at 8 seconds. Showers with a
chance of tstms in the evening, then a chance of showers after
midnight.
.FRI...W winds 15 to 20 kt with gusts to 25 kt. Seas 5 to 7 ft.
Wave Detail: SE 6 ft at 8 seconds. A slight chance of showers in
the morning.
.FRI NIGHT...N winds 10 to 15 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft.
.SAT NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN...NW winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN NIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft.
Winds and seas higher in and near tstms.
$$
CWFCHS
Coastal Waters Forecast
National Weather Service Charleston SC
1219 AM 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
AMZ300-171800-
1219 AM EST Wed Dec 17 2025
.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
High pressure will prevail through Thursday before a cold front
pushes offshore Friday morning. High pressure returns during the
weekend, followed by another cold front arriving early next week.
$$
AMZ330-171800-
Charleston Harbor-
1220 AM EST Wed Dec 17 2025
.REST OF TONIGHT...Light and variable winds, becoming NW 5 kt
late.
.WED...NW winds 5 kt, becoming SW in the afternoon.
.WED NIGHT...E winds 5 kt. A chance of rain after midnight.
.THU...E winds 5 kt, becoming S in the afternoon. A chance of
showers in the morning, then showers with a chance of tstms in
the afternoon.
.THU NIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt with
gusts to 20 kt after midnight. Showers with a chance of tstms in
the evening, then a chance of showers after midnight.
.FRI...W winds 10 to 15 kt. A slight chance of showers in the
morning.
.FRI NIGHT...NW winds 5 kt.
.SAT...E winds 5 kt.
.SAT NIGHT...SW winds 5 kt.
.SUN...W winds 5 kt.
.SUN NIGHT...N winds 5 to 10 kt.
Winds and waves higher in and near tstms.
Unless otherwise noted, waves 1 foot or less.
Charleston Harbor water temperature 53 degrees.
$$
AMZ350-171800-
Waters from South Santee River to Edisto Beach SC out 20 NM-
1220 AM EST Wed Dec 17 2025
.REST OF TONIGHT...W winds 5 kt. Seas 2 to 3 ft. Wave Detail: E
2 ft at 10 seconds.
.WED...NW winds 5 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at
10 seconds.
.WED NIGHT...E winds 5 kt, increasing to 5 to 10 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 10 seconds and
SE 1 foot at 4 seconds. A slight chance of rain after midnight.
.THU...SE winds 5 to 10 kt, becoming S in the afternoon. Seas
2 to 3 ft, building to 3 to 4 ft in the afternoon. Wave Detail:
SE 3 ft at 5 seconds and SE 2 ft at 9 seconds, becoming SE 4 ft
at 9 seconds and SE 3 ft at 5 seconds. Showers likely in the
morning, then showers with a chance of tstms in the afternoon.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 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.
Showers with a chance of tstms in the evening, then showers
likely after midnight.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 5 to 7 ft. Wave Detail: SE 7 ft at 9 seconds and
SW 4 ft at 8 seconds. A slight chance of showers in the morning.
.FRI NIGHT...NW winds 5 to 10 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight.
.SAT...NE winds 5 to 10 kt. Seas 2 to 3 ft.
.SAT NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN...W winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN NIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft.
Winds and seas higher in and near tstms.
$$
AMZ352-171800-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
1220 AM EST Wed Dec 17 2025
.REST OF TONIGHT...NE winds 5 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 9 seconds.
.WED...N winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
10 seconds.
.WED NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 10 seconds. A chance of rain after midnight.
.THU...SE winds 10 kt, becoming S in the afternoon. Seas 2 to
3 ft, building to 3 to 4 ft in the afternoon. Wave Detail: SE
3 ft at 10 seconds, becoming SE 4 ft at 7 seconds. Showers. A
chance of tstms in the afternoon.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after
midnight. Seas 3 to 4 ft, building to 4 to 5 ft after midnight.
Wave Detail: SE 4 ft at 7 seconds, becoming SE 5 ft at 7 seconds.
Showers with a chance of tstms in the evening, then a chance of
showers after midnight.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 5 to 6 ft, subsiding to 4 to 6 ft in the
afternoon. Wave Detail: SE 5 ft at 8 seconds. A slight chance of
showers in the morning.
.FRI NIGHT...NW winds 5 to 10 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight.
.SAT...NE winds 5 to 10 kt. Seas 2 to 3 ft.
.SAT NIGHT...W winds 5 kt. Seas 2 ft.
.SUN...W winds 5 kt. Seas 2 ft.
.SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft.
Winds and seas higher in and near tstms.
$$
AMZ354-171800-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
1220 AM EST Wed Dec 17 2025
.REST OF TONIGHT...NE winds 5 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 9 seconds.
.WED...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 10 seconds.
.WED NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 10 seconds. A chance of rain with a slight chance of
tstms after midnight.
.THU...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 10 seconds. Showers. A chance of tstms in the afternoon.
.THU NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft, building to
4 to 5 ft after midnight. Wave Detail: SE 4 ft at 9 seconds,
becoming SE 5 ft at 9 seconds. Showers with a chance of tstms in
the evening, then a chance of showers after midnight.
.FRI...W winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft.
Wave Detail: SE 5 ft at 8 seconds and W 2 ft at 3 seconds. A
slight chance of showers in the morning.
.FRI NIGHT...NW winds 10 kt. Seas 3 to 4 ft.
.SAT...NE winds 5 to 10 kt. Seas 2 to 3 ft.
.SAT NIGHT...SW winds 5 kt. Seas 2 ft.
.SUN...W winds 5 kt. Seas 2 ft.
.SUN NIGHT...NW winds 5 to 10 kt. Seas 2 ft.
Winds and seas higher in and near tstms.
$$
AMZ374-171800-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
1220 AM EST Wed Dec 17 2025
.REST OF TONIGHT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: E 4 ft at 9 seconds.
.WED...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft
at 9 seconds. A slight chance of rain in the afternoon.
.WED NIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 9 seconds. A slight chance of rain in the evening, then a
chance of rain with a slight chance of tstms after midnight.
.THU...S winds 10 kt. Seas 4 to 5 ft. Wave Detail: SE 5 ft at
8 seconds. Showers. A slight chance of tstms in the morning, then
a chance of tstms in the afternoon.
.THU NIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to
6 ft, building to 5 to 7 ft after midnight. Wave Detail: SE 5 ft
at 8 seconds, becoming SE 6 ft at 8 seconds. Showers with a
chance of tstms in the evening, then a chance of showers after
midnight.
.FRI...W winds 15 to 20 kt with gusts to 25 kt. Seas 5 to 7 ft.
Wave Detail: SE 6 ft at 8 seconds. A slight chance of showers in
the morning.
.FRI NIGHT...N winds 10 to 15 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft.
.SAT NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN...NW winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN NIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft.
Winds and seas higher in and near tstms.
$$