Fort Smith Weather in September

What's the weather like in Fort Smith (Arkansas) in September 2025?

The climate in Fort Smith during September can be summarized as warm, humid and damp.

September is in the fall / autumn in Fort Smith and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 29°C (85°F), whilst at night 16°C (61°F) is normal.

Fort Smith weather averages (imperial / metric)
Daytime temperature 29.4°C 84.9°F
Nightly temperature 16.2°C 61.2°F
Average temperature 22.8°C 73°F
Daily sunshine 8.4 hrs
Avg rainfall 107 mm 4.2 ins
Rainy days 8 days
Sea temperature 22.9°C 73.1°F
Humidity 72%
Windspeed 12.2kph 8 mph

On average September is the 3rd wettest month of the year in Fort Smith with around 107mm 4.2 inches of rain making it a damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.4 hours of sunshine per day.

September temperatures in Fort Smith

Fort Smith average temperature in September

September rainfall

Fort Smith average rain in September

September hourly sunshine

Fort Smith 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 Fort Smith 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

Fort Smith weather stats

Fort Smith weather statistics
Hottest month: July 33.5°C 92.3°F
Driest month: January 57mm 2.2ins
Sunniest month: July 11.3hrs
Coldest month: January 8.8°C 47.8°F
Wettest month: May 147mm 5.8ins
Map showing location of Fort Smith (35.38592, -94.39855) Fort Smith map pin © Google

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