Gunnison Weather in September

What's the weather like in Gunnison (Colorado) in September 2025?

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

September is in the fall / autumn in Gunnison and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 21°C (69°F), whilst at night -1°C (31°F) is normal.

Gunnison weather averages (imperial / metric)
Daytime temperature 20.6°C 69.1°F
Nightly temperature -0.6°C 30.9°F
Average temperature 10°C 50°F
Daily sunshine 9.7 hrs
Avg rainfall 31 mm 1.2 ins
Rainy days 7 days
Sea temperature 18.5°C 65.3°F
Humidity 46%
Windspeed 15.1kph 9 mph

On average September is the 5th wettest month of the year in Gunnison with around 31mm 1.2 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 9.7 hours of sunshine per day.

September temperatures in Gunnison

Gunnison average temperature in September

September rainfall

Gunnison average rain in September

September hourly sunshine

Gunnison 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 Gunnison 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

Gunnison weather stats

Gunnison weather statistics
Hottest month: July 25.2°C 77.4°F
Driest month: June 19mm 0.7ins
Sunniest month: October 8.9hrs
Coldest month: January -4°C 24.8°F
Wettest month: August 43mm 1.7ins
Map showing location of Gunnison (38.54582, -106.92532) Gunnison map pin © Google

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