Port Allen Weather in September

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

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

September is in the fall / autumn in Port Allen and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 20°C (69°F) is normal.

Port Allen weather averages (imperial / metric)
Daytime temperature 30.9°C 87.5°F
Nightly temperature 20.4°C 68.6°F
Average temperature 25.6°C 78.1°F
Daily sunshine 8.3 hrs
Avg rainfall 123 mm 4.8 ins
Rainy days 9 days
Sea temperature 28.4°C 83.1°F
Humidity 77%
Windspeed 11.5kph 7 mph

On average September is the 5th driest month of the year in Port Allen with around 123mm 4.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.3 hours of sunshine per day.

September temperatures in Port Allen

Port Allen average temperature in September

September rainfall

Port Allen average rain in September

September hourly sunshine

Port Allen 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 Port Allen 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

Port Allen weather stats

Port Allen weather statistics
Hottest month: July 32.9°C 91.2°F
Driest month: October 89mm 3.5ins
Sunniest month: October 8.4hrs
Coldest month: January 15.4°C 59.7°F
Wettest month: July 171mm 6.7ins
Map showing location of Port Allen (30.45214, -91.21011) Port Allen map pin © Google

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