Billings Weather in September

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

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

September is in the fall / autumn in Billings and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 22°C (72°F), whilst at night 8°C (46°F) is normal.

Billings weather averages (imperial / metric)
Daytime temperature 22.4°C 72.2°F
Nightly temperature 7.7°C 45.8°F
Average temperature 15°C 59°F
Daily sunshine 9.3 hrs
Avg rainfall 35 mm 1.4 ins
Rainy days 7 days
Sea temperature 14.6°C 58.3°F
Humidity 52%
Windspeed 16.2kph 10 mph

On average September is the 4th wettest month of the year in Billings with around 35mm 1.4 inches of rain making it a reasonably 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 9.3 hours of sunshine per day.

September temperatures in Billings

Billings average temperature in September

September rainfall

Billings average rain in September

September hourly sunshine

Billings 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 Billings 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

Billings weather stats

Billings weather statistics
Hottest month: July 30.2°C 86.4°F
Driest month: February 16mm 0.6ins
Sunniest month: August 11.6hrs
Coldest month: January -0.4°C 31.3°F
Wettest month: May 65mm 2.6ins
Map showing location of Billings (45.78329, -108.50069) Billings map pin © Google

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