Superior Weather in September

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

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

September is in the fall / autumn in Superior and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 21°C (70°F), whilst at night 2°C (36°F) is normal.

Superior weather averages (imperial / metric)
Daytime temperature 20.9°C 69.5°F
Nightly temperature 2.2°C 35.9°F
Average temperature 11.5°C 52.7°F
Daily sunshine 9.2 hrs
Avg rainfall 37 mm 1.4 ins
Rainy days 8 days
Sea temperature 13.1°C 55.5°F
Humidity 62%
Windspeed 11.5kph 7 mph

On average September is the 3rd driest month of the year in Superior with around 37mm 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 Superior

Superior average temperature in September

September rainfall

Superior average rain in September

September hourly sunshine

Superior 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 Superior 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

Superior weather stats

Superior weather statistics
Hottest month: July 27°C 80.6°F
Driest month: July 24mm 0.9ins
Sunniest month: July 13.4hrs
Coldest month: January -1.4°C 29.5°F
Wettest month: January 79mm 3.1ins
Map showing location of Superior (47.19159, -114.8918) Superior map pin © Google

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