Chalmette Weather in September

What's the weather like in Chalmette (Louisiana) in September 2025?

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

September is in the fall / autumn in Chalmette and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (87°F), whilst at night 21°C (70°F) is normal.

Chalmette weather averages (imperial / metric)
Daytime temperature 30.5°C 86.8°F
Nightly temperature 21.4°C 70.4°F
Average temperature 25.9°C 78.6°F
Daily sunshine 8.1 hrs
Avg rainfall 149 mm 5.9 ins
Rainy days 10 days
Sea temperature 28.6°C 83.4°F
Humidity 78%
Windspeed 11.9kph 7 mph

On average September is the 3rd wettest month of the year in Chalmette with around 149mm 5.9 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 Chalmette

Chalmette average temperature in September

September rainfall

Chalmette average rain in September

September hourly sunshine

Chalmette 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 Chalmette in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Chalmette weather stats

Chalmette weather statistics
Hottest month: July 32.4°C 90.3°F
Driest month: October 78mm 3.1ins
Sunniest month: April 9.3hrs
Coldest month: January 15.7°C 60.3°F
Wettest month: July 164mm 6.5ins
Map showing location of Chalmette (29.9427, -89.9634) Chalmette map pin © Google

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