Sundance Weather in September

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

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

September is in the fall / autumn in Sundance and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 22°C (71°F), whilst at night 6°C (43°F) is normal.

Sundance weather averages (imperial / metric)
Daytime temperature 21.6°C 70.8°F
Nightly temperature 6.1°C 42.9°F
Average temperature 13.8°C 56.8°F
Daily sunshine 9.2 hrs
Avg rainfall 34 mm 1.4 ins
Rainy days 8 days
Sea temperature 15.6°C 60°F
Humidity 55%
Windspeed 17.3kph 11 mph

On average September is the 6th wettest month of the year in Sundance with around 34mm 1.4 inches of rain making it a reasonably dry 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 9.2 hours of sunshine per day.

September temperatures in Sundance

Sundance average temperature in September

September rainfall

Sundance average rain in September

September hourly sunshine

Sundance 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 Sundance 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

Sundance weather stats

Sundance weather statistics
Hottest month: July 28.9°C 84°F
Driest month: January 14mm 0.6ins
Sunniest month: August 11hrs
Coldest month: January -0.9°C 30.4°F
Wettest month: June 81mm 3.2ins
Map showing location of Sundance (44.40637, -104.37578) Sundance map pin © Google

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