Littleton Weather in September

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

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

September is in the fall / autumn in Littleton and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 25°C (76°F), whilst at night 7°C (44°F) is normal.

Littleton weather averages (imperial / metric)
Daytime temperature 24.6°C 76.2°F
Nightly temperature 6.9°C 44.3°F
Average temperature 15.7°C 60.3°F
Daily sunshine 9.8 hrs
Avg rainfall 32 mm 1.2 ins
Rainy days 7 days
Sea temperature 18.2°C 64.7°F
Humidity 50%
Windspeed 14.8kph 9 mph

On average September is the 6th driest month of the year in Littleton with around 32mm 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 9.8 hours of sunshine per day.

September temperatures in Littleton

Littleton average temperature in September

September rainfall

Littleton average rain in September

September hourly sunshine

Littleton 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 Littleton 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

Littleton weather stats

Littleton weather statistics
Hottest month: July 30.1°C 86.2°F
Driest month: January 13mm 0.5ins
Sunniest month: September 9.8hrs
Coldest month: January 6.5°C 43.7°F
Wettest month: May 67mm 2.6ins
Map showing location of Littleton (39.61332, -105.01665) Littleton map pin © Google

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