Grand Isle, LA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Isle, a town in Jefferson County, Louisiana.
Today
88°F
Sunny
Sunny. High near 88, with temperatures falling to around 86 in the afternoon. East wind 5 to 10 mph.
7-day forecast for Grand Isle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 5 to 10 mph E | 2% |
| Tonight | 82°F | Mostly Clear | 0 to 5 mph SE | 2% |
| Sunday | 88°F | Sunny | 0 to 5 mph E | 4% |
| Sunday Night | 81°F | Mostly Clear | 5 mph SE | 5% |
| Monday | 88°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 37% |
| Monday Night | 81°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph E | 16% |
| Tuesday | 88°F | Sunny | 5 to 10 mph NE | 10% |
| Tuesday Night | 81°F | Mostly Clear | 5 mph E | 9% |
| Wednesday | 88°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 15 mph NE | 15% |
| Wednesday Night | 80°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph E | 15% |
| Thursday | 87°F | Sunny then Slight Chance Showers And Thunderstorms | 15 mph NE | 19% |
| Thursday Night | 80°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 10 to 15 mph E | 19% |
| Friday | 86°F | Mostly Sunny | 15 mph NE | 12% |
| Friday Night | 79°F | Partly Cloudy | 10 to 15 mph E | 12% |
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 19, 2026.