Circle Weather in September

What's the weather like in Circle (Montana) in September 2025?

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

September is in the fall / autumn in Circle and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (72°F), whilst at night 6°C (43°F) is normal.

Circle weather averages (imperial / metric)
Daytime temperature 22.5°C 72.4°F
Nightly temperature 6.2°C 43.1°F
Average temperature 14.3°C 57.7°F
Daily sunshine 8.7 hrs
Avg rainfall 29 mm 1.1 ins
Rainy days 7 days
Sea temperature 13.8°C 56.9°F
Humidity 56%
Windspeed 17.3kph 11 mph

On average September is the 5th wettest month of the year in Circle with around 29mm 1.1 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 8.7 hours of sunshine per day.

September temperatures in Circle

Circle average temperature in September

September rainfall

Circle average rain in September

September hourly sunshine

Circle 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 Circle 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

Circle weather stats

Circle weather statistics
Hottest month: July 30.6°C 87.1°F
Driest month: February 7mm 0.3ins
Sunniest month: July 12.5hrs
Coldest month: January -5.6°C 21.9°F
Wettest month: June 66mm 2.6ins
Map showing location of Circle (47.41668, -105.59222) Circle map pin © Google

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