Grand Isle Weather in September

What's the weather like in Grand Isle (Louisiana) in September 2022?

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

September is in the fall / autumn in Grand Isle and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 30°C (87°F), whilst at night 22°C (71°F) is normal.

Grand Isle weather averages (imperial / metric)
Daytime temperature 30.4°C 86.7°F
Nightly temperature 21.8°C 71.2°F
Average temperature 26.1°C 78.9°F
Daily sunshine 8.1 hrs
Avg rainfall 165 mm 6.5 ins
Rainy days 10 days
Sea temperature 28.6°C 83.4°F
Humidity 78%
Windspeed 11.5kph 7 mph

On average September is the 3rd wettest month of the year in Grand Isle with around 165mm 6.5 inches of rain making it a wet time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.1 hours of sunshine per day.

September temperatures in Grand Isle

Grand Isle average temperature in September

September rainfall

Grand Isle average rain in September

September hourly sunshine

Grand Isle average rain in September

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 September 2022.

Other monthly averages

Best places to visit in September

UV index Best time to go?

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)

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