Grand Isle, LA Weather & Growing Conditions
This Afternoon
90°F
Sunny
Sunny. High near 90, with temperatures falling to around 88 in the afternoon. East wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 90°F | Sunny | 5 to 10 mph E | 2% |
| Tonight | 78°F | Mostly Clear | 0 to 5 mph SE | 2% |
| Sunday | 91°F | Sunny | 0 to 5 mph E | 2% |
| Sunday Night | 78°F | Mostly Clear | 0 to 5 mph SE | 3% |
| Monday | 91°F | Chance Showers And Thunderstorms | 0 to 5 mph NE | 38% |
| Monday Night | 76°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 mph | 24% |
| Tuesday | 91°F | Sunny | 0 to 5 mph NE | 14% |
| Tuesday Night | 77°F | Mostly Clear | 0 to 5 mph E | 14% |
| Wednesday | 91°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph NE | 17% |
| Wednesday Night | 76°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 mph NE | 17% |
| Thursday | 89°F | Sunny then Slight Chance Showers And Thunderstorms | 10 to 15 mph NE | 20% |
| Thursday Night | 75°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 to 10 mph E | 20% |
| Friday | 88°F | Mostly Sunny | 10 to 15 mph NE | 11% |
| Friday Night | 74°F | Partly Cloudy | 5 to 10 mph E | 11% |
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 Sep 19, 2026.