Grand Isle, LA Weather & Growing Conditions
Today
78°F
Slight Chance Rain Showers
A slight chance of rain showers between 11am and 2pm. Mostly sunny. High near 78, with temperatures falling to around 76 in the afternoon. Southwest wind 5 to 10 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 | 78°F | Slight Chance Rain Showers | 5 to 10 mph SW | 15% |
| Tonight | 69°F | Partly Cloudy | 5 mph NW | 2% |
| Thursday | 76°F | Sunny | 5 mph W | 2% |
| Thursday Night | 70°F | Partly Cloudy | 0 to 10 mph W | 5% |
| Friday | 76°F | Partly Sunny | 5 to 10 mph N | 12% |
| Friday Night | 66°F | Partly Cloudy | 5 to 15 mph N | 2% |
| Saturday | 73°F | Mostly Sunny | 10 to 15 mph NE | 2% |
| Saturday Night | 62°F | Partly Cloudy | 10 to 15 mph NE | 2% |
| Sunday | 69°F | Slight Chance Rain Showers | 10 to 15 mph N | 15% |
| Sunday Night | 61°F | Partly Cloudy | 15 mph N | 6% |
| Monday | 70°F | Mostly Sunny | 10 to 15 mph NE | 7% |
| Monday Night | 63°F | Mostly Clear | 10 mph NE | 5% |
| Tuesday | 71°F | Sunny | 5 to 10 mph NE | 6% |
| Tuesday Night | 65°F | Partly Cloudy | 5 mph NE | 4% |
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 (24 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.