Grand Isle, LA Weather & Growing Conditions
Today
90°F
Slight Chance Showers And Thunderstorms then Sunny
A slight chance of showers and thunderstorms before noon. Sunny. High near 90, with temperatures falling to around 88 in the afternoon. West wind 0 to 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Slight Chance Showers And Thunderstorms then Sunny | 0 to 5 mph W | 18% |
| Tonight | 78°F | Mostly Clear | 0 to 5 mph W | 6% |
| Wednesday | 90°F | Sunny | 0 to 5 mph SW | 13% |
| Wednesday Night | 78°F | Mostly Clear | 0 to 5 mph S | 3% |
| Thursday | 89°F | Sunny | 0 to 5 mph SE | 12% |
| Thursday Night | 77°F | Mostly Clear | 0 to 5 mph SE | 12% |
| Friday | 89°F | Chance Showers And Thunderstorms | 0 to 10 mph E | 27% |
| Friday Night | 77°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph E | 21% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 0 to 10 mph E | 44% |
| Saturday Night | 78°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph SE | 24% |
| Sunday | 89°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 53% |
| Sunday Night | 78°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 32% |
| Monday | 89°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 49% |
| Monday Night | 78°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph S | 24% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grand Isle, LA
Last spring frost
Feb 8
First fall frost
Dec 19
Growing season
311 days
Hardiness zone
10a
Explore more for Grand Isle, LA: full frost dates · planting calendar · Louisiana frost dates
Climate data from the nearest NOAA station, Galliano, La (15.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.