Weather in Grand Isle, LA
Updated 2026-09-26 10:00 local time · ZIP codes 70358
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
79°15% rain
79°5% rain80°4% rain80°15% rain
80°11% rain80°16% rain81°15% rain81°15% rain82°14% rain
83°14% rain83°13% rain82°14% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 16%).
It feels like 81°F with winds near 8 mph.
80°F, 4% rain chance and 4 mph wind.
Visibility is around 6 mi; gusts may reach 17 mph.
Current temperature is 79°F, wind 8 mph, rain chance up to 16%.
UV index is 3. Sunscreen and sunglasses are sensible for longer outdoor time.
Local weather characteristics in Grand Isle
Louisiana is warm, humid and rainy, with hot summers, mild winters, frequent thunderstorms and exposure to tropical storms and hurricanes near the Gulf Coast.
Grand Isle is part of the South weather region. The forecast point is near 29.21°N latitude and 90.04°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Grand Isle weather today
Overcast and 79°F in Grand Isle, LA. Today's high is 83°F with a 9% rain chance. Winds are around 8 mph with gusts near 9 mph. Relative humidity is 65%, pressure is 30.04 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Grand Isle
Sunrise is at 06:50 AM and sunset is at 06:52 PM. Tomorrow's forecast calls for Sunny with a high near 84°F and a low near 78°F. The maximum rain chance is 8%.