Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

For More Weather Information:

Charleston, SC Local Forecast Office

Charleston Harbor MR

Marine Point Forecast

[NOTICE]

Today
WSW 13kt
< 1ft
Tonight
SW 11kt
< 1ft
Thursday
SW 15kt
< 1ft
Thursday Night
SW 15kt
< 1ft
Juneteenth
WSW 17kt
< 1ft
Friday Night
SW 11kt
< 1ft
Saturday
NW 7kt
< 1ft
Saturday Night
Light Wind
< 1ft
Sunday
⇑S 10kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 7:22 am EDT Jun 17, 2026
Forecast Valid: 9am EDT Jun 17, 2026-6pm EDT Jun 23, 2026

View Nearby Observations

Detailed Forecast

Today

WSW wind 11 to 13 kt, with gusts as high as 20 kt. Showers likely, with thunderstorms also possible after 10am. Seas 1 ft or less.

Tonight

SW wind around 11 kt. A chance of showers and thunderstorms, mainly before 7pm. Seas 1 ft or less.

Thursday

SW wind 10 to 15 kt, with gusts as high as 21 kt. A chance of showers and thunderstorms after 2pm. Seas 1 ft or less.

Thursday Night

SW wind 13 to 15 kt, with gusts as high as 22 kt. A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 5am, then showers likely after 5am. Seas 1 ft or less.

Juneteenth

WSW wind 15 to 17 kt, with gusts as high as 25 kt. Showers, with thunderstorms also possible after 8am. Seas 1 ft or less.

Friday Night

SW wind 8 to 11 kt becoming W after midnight. Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Seas 1 ft or less.

Saturday

NW wind around 7 kt becoming NNE in the afternoon. A slight chance of showers and thunderstorms before 2pm. Seas 1 ft or less.

Saturday Night

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

Sunday

Variable winds less than 5 kt becoming S 5 to 10 kt in the afternoon. Mostly sunny. 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 82 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.