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Charleston, SC Local Forecast Office

Charleston Harbor MR

Marine Point Forecast

[NOTICE]

Overnight
Light Wind
< 1ft
Wednesday
⇑S 8kt
< 1ft
Wednesday Night
SSW 8kt
< 1ft
Thursday
SSW 9kt
< 1ft
Thursday Night
SSW 9kt
< 1ft
Friday
SSW 10kt
< 1ft
Friday Night
SSW 8kt
< 1ft
Saturday
⇑SW 12kt
< 1ft
Saturday Night
SSW 10kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 10:25 pm EDT Apr 21, 2026
Forecast Valid: 11pm EDT Apr 21, 2026-6pm EDT Apr 28, 2026

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Detailed Forecast

Overnight

Variable winds 5 kt or less. Partly cloudy. Seas 1 ft or less.

Wednesday

Variable winds less than 5 kt becoming S 5 to 8 kt in the afternoon. Mostly sunny. Seas 1 ft or less.

Wednesday Night

SSW wind 6 to 8 kt. Mostly clear. Seas 1 ft or less.

Thursday

WSW wind 5 to 9 kt becoming SSW in the afternoon. Sunny. Seas 1 ft or less.

Thursday Night

SSW wind 7 to 9 kt. Mostly clear. Seas 1 ft or less.

Friday

WSW wind 5 to 10 kt becoming SSW in the afternoon. Sunny. Seas 1 ft or less.

Friday Night

SSW wind around 8 kt. Mostly clear. Seas 1 ft or less.

Saturday

SW wind 6 to 9 kt increasing to 9 to 12 kt in the afternoon. A slight chance of showers and thunderstorms after 2pm. Seas 1 ft or less.

Saturday Night

SSW wind 6 to 10 kt becoming WSW after midnight. A slight chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Seas 1 ft or less.

Winds and waves higher in and near tstms.

*Notices:

This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.