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
Slight Chance Showers And Thunderstorms then Sunny
A slight chance of showers and thunderstorms before noon. Sunny, with a high near 88. West wind around 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grand Isle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Slight Chance Showers And Thunderstorms then Sunny | 5 mph W | 20% |
| Tonight | 82°F | Mostly Clear | 5 mph SW | 4% |
| Wednesday | 88°F | Sunny | 5 mph SW | 14% |
| Wednesday Night | 82°F | Mostly Clear | 5 mph S | 3% |
| Thursday | 88°F | Sunny | 0 to 5 mph S | 9% |
| Thursday Night | 81°F | Mostly Clear | 5 mph SE | 9% |
| Friday | 87°F | Chance Showers And Thunderstorms | 5 to 10 mph E | 30% |
| Friday Night | 82°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph E | 21% |
| Saturday | 87°F | Chance Showers And Thunderstorms | 5 to 10 mph E | 42% |
| Saturday Night | 82°F | Slight Chance Showers And Thunderstorms | 5 mph SE | 22% |
| Sunday | 87°F | Chance Showers And Thunderstorms | 5 mph SE | 52% |
| Sunday Night | 82°F | Chance Showers And Thunderstorms | 5 mph S | 27% |
| Monday | 87°F | Chance Showers And Thunderstorms | 5 mph S | 45% |
| Monday Night | 82°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 19% |
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 Aug 4, 2026.