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Charleston Harbor MR

[NOTICE]

Last Update: 8:32 am EDT Aug 18, 2026
Forecast Valid: 8am EDT Aug 18, 2026-6pm EDT Aug 24, 2026

Today

WNW wind 6 to 10 kt becoming SSW in the afternoon. A slight chance of showers and thunderstorms between 4pm and 5pm. Seas 1 ft or less.

Tonight

SW wind 5 to 9 kt becoming variable and less than 5 kt after midnight. A slight chance of showers and thunderstorms before 9pm. Seas 1 ft or less.

Wednesday

Variable winds less than 5 kt becoming SSE 5 to 9 kt in the afternoon. Sunny. Seas 1 ft or less.

Wednesday Night

S wind 5 to 7 kt becoming variable and less than 5 kt after midnight. Mostly clear. Seas 1 ft or less.

Thursday

Variable winds less than 5 kt becoming S 5 to 10 kt 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

S wind 5 to 8 kt increasing to 9 to 12 kt in the afternoon. Sunny. Seas 1 ft or less.

Friday Night

SSW wind 7 to 10 kt. A chance of showers and thunderstorms, mainly before 2am. Seas 1 ft or less.

Saturday

SSW wind 5 to 8 kt increasing to 10 to 13 kt in the afternoon. A chance of showers and thunderstorms, mainly after 2pm. Seas 1 ft or less.

Winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston Harbor water temperature 87 degrees.

*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.