Grand Isle Weather in August

What's the weather like in Grand Isle (Louisiana) in August 2025?

The climate in Grand Isle during August can be summarized as hot, humid and wet.

August is in the summer in Grand Isle and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a steamy 32°C (90°F), whilst at night 23°C (74°F) is normal.

Grand Isle weather averages (imperial / metric)
Daytime temperature 32.1°C 89.8°F
Nightly temperature 23.4°C 74.2°F
Average temperature 27.8°C 82°F
Daily sunshine 8.6 hrs
Avg rainfall 169 mm 6.7 ins
Rainy days 13 days
Sea temperature 29.7°C 85.5°F
Humidity 79%
Windspeed 10.1kph 6 mph

On average August is the wettest month of the year in Grand Isle with around 169mm 6.7 inches of rain making it a wet time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.6 hours of sunshine per day.

August temperatures in Grand Isle

Grand Isle average temperature in August

August rainfall

Grand Isle average rain in August

August hourly sunshine

Grand Isle average rain in August

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Grand Isle in August 2025.

Other monthly averages

Best places to visit in August

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Grand Isle weather stats

Grand Isle weather statistics
Hottest month: July 32.1°C 89.8°F
Driest month: October 82mm 3.2ins
Sunniest month: April 9.7hrs
Coldest month: January 16.3°C 61.3°F
Wettest month: August 169mm 6.7ins
Map showing location of Grand Isle (29.23662, -89.98729) Grand Isle map pin © Google

Locations nearby

Top United States locations