Greeley Weather in September

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

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

September is in the fall / autumn in Greeley and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (76°F), whilst at night 8°C (47°F) is normal.

Greeley weather averages (imperial / metric)
Daytime temperature 24.5°C 76.1°F
Nightly temperature 8.3°C 46.9°F
Average temperature 16.4°C 61.5°F
Daily sunshine 9.7 hrs
Avg rainfall 32 mm 1.3 ins
Rainy days 7 days
Sea temperature 17.8°C 64°F
Humidity 51%
Windspeed 15.8kph 10 mph

On average September is the 6th wettest month of the year in Greeley with around 32mm 1.3 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 Greeley

Greeley average temperature in September

September rainfall

Greeley average rain in September

September hourly sunshine

Greeley 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 Greeley 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

Greeley weather stats

Greeley weather statistics
Hottest month: July 30.5°C 86.9°F
Driest month: January 10mm 0.4ins
Sunniest month: September 9.7hrs
Coldest month: January 5°C 41°F
Wettest month: May 70mm 2.8ins
Map showing location of Greeley (40.42331, -104.70913) Greeley map pin © Google

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