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New Orleans/Baton Rouge, LA Local Forecast Office

17NM E Grand Isle LA

Marine Point Forecast

[NOTICE]

Overnight
Low: 80 °F
Tropical Storm Conditions Possible
Thursday
High: 91 °F
S 20kt
1ft
Thursday Night
Low: 81 °F
S 10kt
< 1ft
Friday
High: 91 °F
Light Wind
< 1ft
Friday Night
Low: 80 °F
Light Wind
< 1ft
Saturday
High: 91 °F
Light Wind
< 1ft
Saturday Night
Low: 81 °F
Light Wind
< 1ft
Sunday
High: 92 °F
WSW 10kt
< 1ft
Sunday Night
Low: 81 °F
WSW 10kt
< 1ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 11:24 pm CDT Jul 22, 2026
Forecast Valid: 12am CDT Jul 23, 2026-6pm CDT Jul 29, 2026

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Detailed Forecast

...TROPICAL STORM WARNING IN EFFECT...

Overnight

Tropical storm conditions possible. Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 2am, then showers likely and possibly a thunderstorm after 2am. Seas around 1 ft.

Thursday

S wind 15 to 20 kt, with gusts as high as 25 kt. A chance of showers and thunderstorms, mainly before 2pm. Seas around 1 ft.

Thursday Night

S wind 5 to 10 kt. Partly cloudy. Seas 1 ft or less.

Friday

Variable winds 5 kt or less. Mostly sunny. Seas 1 ft or less.

Friday Night

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

Saturday

Variable winds 5 kt or less. Sunny. Seas 1 ft or less.

Saturday Night

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

Sunday

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

Sunday Night

WSW wind around 10 kt. Mostly clear. Seas 1 ft or less.

Winds and seas higher in and near thunderstorms.

*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.