FZUS52 KCHS 181144
CWFCHS
Coastal Waters Forecast
National Weather Service Charleston SC
644 AM EST Thu Dec 18 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
AMZ300-190015-
644 AM EST Thu Dec 18 2025
.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
A warm front will shift north across the area today before a cold
front arrives tonight. High pressure will then prevail during the
weekend. Another cold front could shift across the area Monday,
before high pressure returns and prevails into the middle of next
week.
$$
AMZ330-190015-
Charleston Harbor-
644 AM EST Thu Dec 18 2025
.TODAY...SE winds 10 kt, increasing to 10 to 15 kt. A slight
chance of rain this morning, then a chance of rain early this
afternoon. Rain with a slight chance of tstms late.
.TONIGHT...S winds 10 kt, becoming SW after midnight. Gusts to
25 kt. A chance of tstms. Rain, mainly in the evening. Vsby 1 NM
or less.
.FRI...W winds 10 to 15 kt with gusts to 25 kt.
.FRI NIGHT...NW winds 5 to 10 kt, becoming N after midnight.
.SAT...NE winds 5 kt.
.SAT NIGHT...E winds 5 kt, becoming W after midnight.
.SUN...W winds 5 kt.
.SUN NIGHT...N winds 10 to 15 kt.
.MON...NE winds 10 to 15 kt.
.MON NIGHT...NE winds 5 to 10 kt.
Winds and waves higher in and near tstms.
Unless otherwise noted, waves 1 foot or less.
Charleston Harbor water temperature 53 degrees.
$$
AMZ350-190015-
Waters from South Santee River to Edisto Beach SC out 20 NM-
644 AM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
FRIDAY EVENING...
.TODAY...SE winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft,
building to 4 to 5 ft this afternoon. Wave Detail: SE 3 ft at 6
seconds and SE 2 ft at 9 seconds, becoming SE 5 ft at 8 seconds. A
slight chance of rain this morning, then a chance of rain early
this afternoon. Rain with a chance of tstms late.
.TONIGHT...S winds 15 to 20 kt, becoming SW 20 to 25 kt after
midnight. Seas 4 to 6 ft, building to 6 to 8 ft after midnight.
Wave Detail: SE 6 ft at 8 seconds, becoming SE 8 ft at 8 seconds.
Rain with a chance of tstms in the evening, then a chance of rain
with a slight chance of tstms after midnight. Vsby 1 NM or less.
.FRI...W winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the
afternoon. Wave Detail: S 8 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 to 15 kt, becoming N after midnight.
Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight. Wave
Detail: SE 4 ft at 9 seconds and SW 3 ft at 7 seconds, becoming
SE 4 ft at 9 seconds and SW 2 ft at 5 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 9 seconds and SW 1 foot at 5 seconds.
.SAT NIGHT...E winds 5 kt, becoming W after midnight. Seas 3 ft.
Wave Detail: SE 3 ft at 9 seconds.
.SUN...W winds 5 to 10 kt. Seas 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 4 to 6 ft.
.MON...NE winds 20 to 25 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.
$$
AMZ352-190015-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
644 AM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
FRIDAY AFTERNOON...
.TODAY...SE winds 10 to 15 kt. Seas 3 to 4 ft, building to 4 to
5 ft this afternoon. Wave Detail: SE 3 ft at 6 seconds and SE
3 ft at 10 seconds, becoming SE 4 ft at 8 seconds. A chance of
rain until late afternoon. A slight chance of tstms early this
afternoon, then rain likely with a chance of tstms late.
.TONIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt with gusts
to 25 kt after midnight. Seas 4 to 5 ft, building to 5 to 7 ft.
Wave Detail: SE 5 ft at 8 seconds, becoming SE 6 ft at 8 seconds.
A chance of tstms. Rain, mainly in the evening. Vsby 1 NM or less.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 5 to 7 ft, subsiding to 4 to 6 ft in the
afternoon. Wave Detail: SE 6 ft at 9 seconds. A slight chance of
rain in the morning.
.FRI NIGHT...NW winds 10 to 15 kt, becoming N after midnight.
Seas 3 to 4 ft. Wave Detail: SE 4 ft at 9 seconds and W 2 ft at
5 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SAT NIGHT...E winds 5 kt, becoming W after midnight. Seas 3 ft.
Wave Detail: SE 3 ft at 9 seconds.
.SUN...W winds 5 kt. Seas 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 4 to 5 ft.
.MON...NE winds 15 to 20 kt. Seas 4 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
Winds and seas higher in and near tstms.
$$
AMZ354-190015-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
644 AM EST Thu Dec 18 2025
.TODAY...SE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE
3 ft at 6 seconds and E 3 ft at 10 seconds. A chance of rain. A
chance of tstms this afternoon.
.TONIGHT...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 8 seconds, becoming SE 6 ft at 8 seconds.
A chance of tstms. Rain, mainly in the evening. Vsby 1 NM or
less.
.FRI...W winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 6 ft,
subsiding to 4 to 5 ft in the afternoon. Wave Detail: SE 6 ft at
9 seconds, becoming SE 5 ft at 9 seconds. A slight chance of rain
in the morning.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail:
SE 4 ft at 9 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 ft. Wave Detail: E 3 ft at
9 seconds.
.SAT NIGHT...Variable winds 5 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 9 seconds.
.SUN...NW 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 20 to 25 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.
$$
AMZ374-190015-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
644 AM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM 4 PM EST THIS AFTERNOON
THROUGH FRIDAY EVENING...
.TODAY...SE winds 10 to 15 kt with gusts to 20 kt. Seas 4 to
5 ft, building to 4 to 6 ft this afternoon. Wave Detail: SE 4 ft
at 6 seconds and SE 3 ft at 9 seconds, becoming SE 6 ft at
8 seconds. A chance of rain this morning, then rain likely with a
chance of tstms this afternoon.
.TONIGHT...SW winds 15 to 20 kt with gusts to 30 kt. Seas 5 to
7 ft, building to 6 to 8 ft after midnight. Wave Detail: SE 7 ft
at 8 seconds. A chance of tstms. Rain, mainly in the evening.
Vsby 1 NM or less.
.FRI...W winds 15 to 20 kt with gusts to 30 kt. Seas 6 to 8 ft,
subsiding to 5 to 7 ft in the afternoon. Wave Detail: SE 7 ft at
9 seconds and SW 5 ft at 5 seconds, becoming SE 5 ft at 9 seconds
and W 4 ft at 5 seconds. A slight chance of rain in the morning.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail:
SE 4 ft at 9 seconds and NW 3 ft at 4 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft
at 9 seconds and N 2 ft at 3 seconds.
.SAT NIGHT...SE winds 5 kt, becoming W after midnight. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 3 to 4 ft.
.SUN NIGHT...N winds 20 to 25 kt. Seas 4 to 6 ft.
.MON...NE winds 20 to 25 kt. Seas 6 to 8 ft. A slight chance of
rain.
.MON NIGHT...E winds 15 to 20 kt. Seas 6 to 8 ft. A slight chance
of rain.
Winds and seas higher in and near tstms.
$$
CWFCHS
Coastal Waters Forecast
National Weather Service Charleston SC
644 AM EST Thu Dec 18 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
AMZ300-190015-
644 AM EST Thu Dec 18 2025
.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
A warm front will shift north across the area today before a cold
front arrives tonight. High pressure will then prevail during the
weekend. Another cold front could shift across the area Monday,
before high pressure returns and prevails into the middle of next
week.
$$
AMZ330-190015-
Charleston Harbor-
644 AM EST Thu Dec 18 2025
.TODAY...SE winds 10 kt, increasing to 10 to 15 kt. A slight
chance of rain this morning, then a chance of rain early this
afternoon. Rain with a slight chance of tstms late.
.TONIGHT...S winds 10 kt, becoming SW after midnight. Gusts to
25 kt. A chance of tstms. Rain, mainly in the evening. Vsby 1 NM
or less.
.FRI...W winds 10 to 15 kt with gusts to 25 kt.
.FRI NIGHT...NW winds 5 to 10 kt, becoming N after midnight.
.SAT...NE winds 5 kt.
.SAT NIGHT...E winds 5 kt, becoming W after midnight.
.SUN...W winds 5 kt.
.SUN NIGHT...N winds 10 to 15 kt.
.MON...NE winds 10 to 15 kt.
.MON NIGHT...NE winds 5 to 10 kt.
Winds and waves higher in and near tstms.
Unless otherwise noted, waves 1 foot or less.
Charleston Harbor water temperature 53 degrees.
$$
AMZ350-190015-
Waters from South Santee River to Edisto Beach SC out 20 NM-
644 AM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
FRIDAY EVENING...
.TODAY...SE winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft,
building to 4 to 5 ft this afternoon. Wave Detail: SE 3 ft at 6
seconds and SE 2 ft at 9 seconds, becoming SE 5 ft at 8 seconds. A
slight chance of rain this morning, then a chance of rain early
this afternoon. Rain with a chance of tstms late.
.TONIGHT...S winds 15 to 20 kt, becoming SW 20 to 25 kt after
midnight. Seas 4 to 6 ft, building to 6 to 8 ft after midnight.
Wave Detail: SE 6 ft at 8 seconds, becoming SE 8 ft at 8 seconds.
Rain with a chance of tstms in the evening, then a chance of rain
with a slight chance of tstms after midnight. Vsby 1 NM or less.
.FRI...W winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the
afternoon. Wave Detail: S 8 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 to 15 kt, becoming N after midnight.
Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight. Wave
Detail: SE 4 ft at 9 seconds and SW 3 ft at 7 seconds, becoming
SE 4 ft at 9 seconds and SW 2 ft at 5 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 9 seconds and SW 1 foot at 5 seconds.
.SAT NIGHT...E winds 5 kt, becoming W after midnight. Seas 3 ft.
Wave Detail: SE 3 ft at 9 seconds.
.SUN...W winds 5 to 10 kt. Seas 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 4 to 6 ft.
.MON...NE winds 20 to 25 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.
$$
AMZ352-190015-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
644 AM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
FRIDAY AFTERNOON...
.TODAY...SE winds 10 to 15 kt. Seas 3 to 4 ft, building to 4 to
5 ft this afternoon. Wave Detail: SE 3 ft at 6 seconds and SE
3 ft at 10 seconds, becoming SE 4 ft at 8 seconds. A chance of
rain until late afternoon. A slight chance of tstms early this
afternoon, then rain likely with a chance of tstms late.
.TONIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt with gusts
to 25 kt after midnight. Seas 4 to 5 ft, building to 5 to 7 ft.
Wave Detail: SE 5 ft at 8 seconds, becoming SE 6 ft at 8 seconds.
A chance of tstms. Rain, mainly in the evening. Vsby 1 NM or less.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 5 to 7 ft, subsiding to 4 to 6 ft in the
afternoon. Wave Detail: SE 6 ft at 9 seconds. A slight chance of
rain in the morning.
.FRI NIGHT...NW winds 10 to 15 kt, becoming N after midnight.
Seas 3 to 4 ft. Wave Detail: SE 4 ft at 9 seconds and W 2 ft at
5 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SAT NIGHT...E winds 5 kt, becoming W after midnight. Seas 3 ft.
Wave Detail: SE 3 ft at 9 seconds.
.SUN...W winds 5 kt. Seas 3 ft.
.SUN NIGHT...N winds 15 to 20 kt. Seas 4 to 5 ft.
.MON...NE winds 15 to 20 kt. Seas 4 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
Winds and seas higher in and near tstms.
$$
AMZ354-190015-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
644 AM EST Thu Dec 18 2025
.TODAY...SE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE
3 ft at 6 seconds and E 3 ft at 10 seconds. A chance of rain. A
chance of tstms this afternoon.
.TONIGHT...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 8 seconds, becoming SE 6 ft at 8 seconds.
A chance of tstms. Rain, mainly in the evening. Vsby 1 NM or
less.
.FRI...W winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 6 ft,
subsiding to 4 to 5 ft in the afternoon. Wave Detail: SE 6 ft at
9 seconds, becoming SE 5 ft at 9 seconds. A slight chance of rain
in the morning.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail:
SE 4 ft at 9 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 ft. Wave Detail: E 3 ft at
9 seconds.
.SAT NIGHT...Variable winds 5 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 9 seconds.
.SUN...NW 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 20 to 25 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.
$$
AMZ374-190015-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
644 AM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM 4 PM EST THIS AFTERNOON
THROUGH FRIDAY EVENING...
.TODAY...SE winds 10 to 15 kt with gusts to 20 kt. Seas 4 to
5 ft, building to 4 to 6 ft this afternoon. Wave Detail: SE 4 ft
at 6 seconds and SE 3 ft at 9 seconds, becoming SE 6 ft at
8 seconds. A chance of rain this morning, then rain likely with a
chance of tstms this afternoon.
.TONIGHT...SW winds 15 to 20 kt with gusts to 30 kt. Seas 5 to
7 ft, building to 6 to 8 ft after midnight. Wave Detail: SE 7 ft
at 8 seconds. A chance of tstms. Rain, mainly in the evening.
Vsby 1 NM or less.
.FRI...W winds 15 to 20 kt with gusts to 30 kt. Seas 6 to 8 ft,
subsiding to 5 to 7 ft in the afternoon. Wave Detail: SE 7 ft at
9 seconds and SW 5 ft at 5 seconds, becoming SE 5 ft at 9 seconds
and W 4 ft at 5 seconds. A slight chance of rain in the morning.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail:
SE 4 ft at 9 seconds and NW 3 ft at 4 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft
at 9 seconds and N 2 ft at 3 seconds.
.SAT NIGHT...SE winds 5 kt, becoming W after midnight. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 3 to 4 ft.
.SUN NIGHT...N winds 20 to 25 kt. Seas 4 to 6 ft.
.MON...NE winds 20 to 25 kt. Seas 6 to 8 ft. A slight chance of
rain.
.MON NIGHT...E winds 15 to 20 kt. Seas 6 to 8 ft. A slight chance
of rain.
Winds and seas higher in and near tstms.
$$