Grand Isle, LA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Isle, a town in Jefferson County, Louisiana.
Overnight
81°F
Mostly Clear
Mostly clear. Low around 81, with temperatures rising to around 83 overnight. Southeast wind 0 to 5 mph.
7-day forecast for Grand Isle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 81°F | Mostly Clear | 0 to 5 mph SE | 1% |
| Sunday | 87°F | Sunny | 0 to 10 mph E | 4% |
| Sunday Night | 81°F | Mostly Clear | 0 to 5 mph SW | 2% |
| Monday | 88°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph NE | 23% |
| Monday Night | 81°F | Mostly Clear | 0 to 5 mph E | 14% |
| Tuesday | 88°F | Sunny | 5 to 10 mph NE | 13% |
| Tuesday Night | 81°F | Mostly Clear | 0 to 10 mph E | 12% |
| Wednesday | 88°F | Sunny | 5 to 15 mph NE | 12% |
| Wednesday Night | 81°F | Mostly Clear | 5 to 10 mph E | 12% |
| Thursday | 87°F | Sunny | 15 mph NE | 7% |
| Thursday Night | 80°F | Mostly Clear | 10 to 15 mph E | 7% |
| Friday | 87°F | Mostly Sunny | 15 mph E | 8% |
| Friday Night | 80°F | Partly Cloudy | 5 to 10 mph E | 8% |
| Saturday | 86°F | Mostly Sunny | 10 to 15 mph E | 8% |
Forecast source: National Weather Service (api.weather.gov) for Grand Isle (29.213, -90.029). Updated through the day.
Growing snapshot for Grand Isle
Last spring frost
Feb 8
First fall frost
Dec 19
Growing season
311 days
Hardiness zone
10a
More local growing data for Grand Isle: nearby ZIP 70358 weather · frost dates · planting calendar · Louisiana frost dates
Nearby towns & communities
Avondale
Barataria
Belle Chasse
Bridge City
Elmwood
Estelle
Gretna
Harahan
Harvey
Jean Lafitte
Jefferson
Kenner
Lafitte
Metairie
New Orleans Station
River Ridge
Terrytown
Timberlane
Waggaman
Woodmere
Climate data from the nearest NOAA station, Galliano, La (24 mi from Grand Isle). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.