Basin Weather in September

What's the weather like in Basin (Wyoming) in September 2025?

The climate in Basin during September can be summarized as mild and dry.

September is in the fall / autumn in Basin and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 5°C (41°F) is normal.

Basin weather averages (imperial / metric)
Daytime temperature 24.1°C 75.4°F
Nightly temperature 4.9°C 40.8°F
Average temperature 14.5°C 58.1°F
Daily sunshine 9.5 hrs
Avg rainfall 20 mm 0.8 ins
Rainy days 7 days
Sea temperature 15.1°C 59.2°F
Humidity 50%
Windspeed 14kph 9 mph

On average September is the 3rd wettest month of the year in Basin with around 20mm 0.8 inches of rain making it a dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.5 hours of sunshine per day.

September temperatures in Basin

Basin average temperature in September

September rainfall

Basin average rain in September

September hourly sunshine

Basin 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 Basin 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

Basin weather stats

Basin weather statistics
Hottest month: July 32°C 89.6°F
Driest month: February 4mm 0.2ins
Sunniest month: August 11.4hrs
Coldest month: January -2.6°C 27.3°F
Wettest month: May 32mm 1.3ins
Map showing location of Basin (44.37996, -108.03899) Basin map pin © Google

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