Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

For More Weather Information:

Charleston, SC Local Forecast Office

Charleston Harbor MR

Marine Point Forecast

[NOTICE]

Tonight
SW 11kt
< 1ft
Thursday
SW 15kt
< 1ft
Thursday Night
SW 15kt
< 1ft
Juneteenth
WSW 20kt
< 1ft
Friday Night
WSW 10kt
< 1ft
Saturday
E 8kt
< 1ft
Saturday Night
Light Wind
< 1ft
Sunday
⇑S 11kt
< 1ft
Sunday Night
S 9kt
< 1ft

Associated Zone Forecast which includes this point

Last Update: 8:30 pm EDT Jun 17, 2026
Forecast Valid: 10pm EDT Jun 17, 2026-6pm EDT Jun 24, 2026

View Nearby Observations

Detailed Forecast

Tonight

SW wind around 11 kt. Partly cloudy. 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 3pm. Seas 1 ft or less.

Thursday Night

SW wind 12 to 15 kt, with gusts as high as 23 kt. A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3am. Seas 1 ft or less.

Juneteenth

WSW wind 15 to 20 kt, with gusts as high as 27 kt. Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Seas 1 ft or less.

Friday Night

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

Saturday

NW wind 6 to 8 kt becoming E in the afternoon. A slight chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms after 2pm. Seas 1 ft or less.

Saturday Night

Variable winds 5 kt or less. A slight chance of showers and thunderstorms before 8pm. Seas 1 ft or less.

Sunday

Variable winds less than 5 kt becoming S 6 to 11 kt in the afternoon. Mostly sunny. Seas 1 ft or less.

Sunday Night

S wind around 9 kt. Partly cloudy. 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 83 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.