Shelby Weather in September

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

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

September is in the fall / autumn in Shelby and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 20°C (68°F), whilst at night 5°C (42°F) is normal.

Shelby weather averages (imperial / metric)
Daytime temperature 20°C 67.9°F
Nightly temperature 5.3°C 41.5°F
Average temperature 12.6°C 54.7°F
Daily sunshine 8.2 hrs
Avg rainfall 28 mm 1.1 ins
Rainy days 6 days
Sea temperature 12.9°C 55.1°F
Humidity 57%
Windspeed 16.2kph 10 mph

On average September is the 5th wettest month of the year in Shelby with around 28mm 1.1 inches of rain making it a dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.2 hours of sunshine per day.

September temperatures in Shelby

Shelby average temperature in September

September rainfall

Shelby average rain in September

September hourly sunshine

Shelby 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 Shelby 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

Shelby weather stats

Shelby weather statistics
Hottest month: July 26.4°C 79.5°F
Driest month: February 8mm 0.3ins
Sunniest month: July 12.6hrs
Coldest month: January -1.8°C 28.8°F
Wettest month: June 69mm 2.7ins
Map showing location of Shelby (48.50526, -111.85697) Shelby map pin © Google

Locations nearby

Top United States locations