448
FZUS52 KCHS 180930
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
530 AM EDT Sat Oct 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

AMZ300-182215-
530 AM EDT Sat Oct 18 2025

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
High pressure will remain across the region through tonight. A
cold front will move through Sunday night, followed by high
pressure early next week. Another cold front will then arrive
Tuesday night, with high pressure to follow.

$$

AMZ330-182215-
Charleston Harbor-
530 AM EDT Sat Oct 18 2025

.TODAY...S winds less than 5 kt, increasing to 5 kt.
.TONIGHT...S winds 5 kt.
.SUN...S winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts to
20 kt in the afternoon.
.SUN NIGHT...SW winds 10 to 15 kt, becoming W after midnight.
.MON...N winds 5 to 10 kt.
.MON NIGHT...NE winds 5 kt.
.TUE...W winds 5 to 10 kt.
.TUE NIGHT...SW winds 5 to 10 kt.
.WED...N winds 10 kt.
.WED NIGHT...N winds 5 to 10 kt.

Unless otherwise noted, waves 1 foot or less.

Charleston Harbor water temperature 70 degrees.

$$

AMZ350-182215-
Waters from South Santee River to Edisto Beach SC out 20 NM-
530 AM EDT Sat Oct 18 2025

.TODAY...S winds 5 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
9 seconds.
.TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 11 seconds.
.SUN...S winds 10 to 15 kt, becoming SW 15 to 20 kt in the
afternoon. Seas 3 to 4 ft, building to 4 to 5 ft in the
afternoon. Wave Detail: S 3 ft at 4 seconds and E 3 ft at
13 seconds, becoming S 4 ft at 5 seconds and E 3 ft at
12 seconds.
.SUN NIGHT...SW winds 15 to 20 kt, becoming W after midnight.
Seas 4 to 5 ft. Wave Detail: S 5 ft at 6 seconds and E 2 ft at
12 seconds. A slight chance of showers.
.MON...N winds 15 to 20 kt, diminishing to 5 to 10 kt in the
afternoon. Seas 4 to 5 ft, subsiding to 3 to 4 ft in the
afternoon. Wave Detail: S 4 ft at 6 seconds and NW 2 ft at
3 seconds, becoming S 3 ft at 6 seconds and N 2 ft at 3 seconds.
.MON NIGHT...NE winds 5 to 10 kt, becoming N after midnight. Seas
2 to 3 ft. Wave Detail: S 2 ft at 5 seconds and E 2 ft at
11 seconds.
.TUE...W winds 5 to 10 kt. Seas 2 ft.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft.
.WED...N winds 10 to 15 kt. Seas 2 to 3 ft.
.WED NIGHT...N winds 10 kt. Seas 2 ft.

$$

AMZ352-182215-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
530 AM EDT Sat Oct 18 2025

.TODAY...SE winds 5 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
9 seconds.
.TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
2 ft at 9 seconds and E 1 foot at 12 seconds.
.SUN...S winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Seas 2 to 3 ft, building to 3 to 4 ft in the
afternoon. Wave Detail: S 2 ft at 4 seconds and E 2 ft at
11 seconds, becoming S 4 ft at 5 seconds and E 2 ft at
13 seconds.
.SUN NIGHT...SW winds 15 to 20 kt, becoming W after midnight.
Seas 4 to 5 ft. Wave Detail: S 4 ft at 5 seconds and E 2 ft at
12 seconds.
.MON...N winds 10 to 15 kt with gusts to 20 kt, becoming NE 5 to
10 kt in the afternoon. Seas 3 to 4 ft, subsiding to 2 to 3 ft in
the afternoon. Wave Detail: S 3 ft at 6 seconds and NW 2 ft at
3 seconds, becoming N 2 ft at 3 seconds and S 2 ft at 5 seconds.
.MON NIGHT...E winds 5 to 10 kt. Seas 2 ft. Wave Detail: NE
1 foot at 3 seconds and S 1 foot at 5 seconds.
.TUE...W winds 5 to 10 kt. Seas 2 ft.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 2 ft.
.WED...N winds 10 to 15 kt. Seas 2 ft.
.WED NIGHT...N winds 5 to 10 kt. Seas 2 ft.

$$

AMZ354-182215-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
530 AM EDT Sat Oct 18 2025

.TODAY...SE winds 5 to 10 kt. Seas 3 to 4 ft, subsiding to 2 to
3 ft this afternoon. Wave Detail: E 3 ft at 9 seconds.
.TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 9 seconds and S 2 ft at 3 seconds.
.SUN...S winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft at 4 seconds and E
2 ft at 12 seconds.
.SUN NIGHT...SW winds 15 kt, becoming NW after midnight. Seas
3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and E 2 ft at
14 seconds.
.MON...N winds 15 to 20 kt, becoming NE 10 to 15 kt in the
afternoon. Seas 3 to 4 ft, subsiding to 2 to 3 ft in the
afternoon. Wave Detail: NW 3 ft at 3 seconds and S 2 ft at
5 seconds, becoming N 2 ft at 3 seconds and E 2 ft at 12 seconds.
.MON NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NE
2 ft at 3 seconds and E 2 ft at 11 seconds.
.TUE...NW winds 5 to 10 kt. Seas 2 ft.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 2 ft.
.WED...N winds 10 to 15 kt. Seas 2 to 3 ft.
.WED NIGHT...N winds 10 kt. Seas 2 ft.

$$

AMZ374-182215-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
530 AM EDT Sat Oct 18 2025

.TODAY...SE winds 5 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft
this afternoon. Wave Detail: E 4 ft at 9 seconds.
.TONIGHT...SE winds 5 to 10 kt, becoming S 10 to 15 kt after
midnight. Seas 3 to 4 ft. Wave Detail: E 4 ft at 10 seconds and S
2 ft at 3 seconds.
.SUN...S winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Seas 4 to 5 ft, building to 4 to 6 ft in the
afternoon. Wave Detail: S 3 ft at 4 seconds and E 3 ft at
12 seconds, becoming S 4 ft at 5 seconds and E 3 ft at
13 seconds.
.SUN NIGHT...SW winds 15 to 20 kt, becoming W after midnight.
Seas 4 to 6 ft. Wave Detail: S 5 ft at 5 seconds and E 3 ft at
13 seconds. A slight chance of showers in the evening.
.MON...N winds 15 to 20 kt with gusts to 25 kt, becoming NE 10 to
15 kt in the afternoon. Seas 4 to 5 ft. Wave Detail: NW 4 ft at
4 seconds and S 3 ft at 5 seconds.
.MON NIGHT...NE winds 5 to 10 kt. Seas 3 to 4 ft, subsiding to
2 to 3 ft after midnight. Wave Detail: N 2 ft at 4 seconds and E
2 ft at 11 seconds, becoming NE 2 ft at 4 seconds and E 2 ft at
11 seconds.
.TUE...NW winds 5 kt. Seas 2 to 3 ft.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft.
.WED...N winds 10 to 15 kt. Seas 3 to 4 ft.
.WED NIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft.

$$