Alamosa Weather in September

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

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

September is in the fall / autumn in Alamosa and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 23°C (73°F), whilst at night 3°C (38°F) is normal.

Alamosa weather averages (imperial / metric)
Daytime temperature 22.7°C 72.8°F
Nightly temperature 3.2°C 37.7°F
Average temperature 12.9°C 55.2°F
Daily sunshine 10 hrs
Avg rainfall 24 mm 0.9 ins
Rainy days 7 days
Sea temperature 19.3°C 66.7°F
Humidity 48%
Windspeed 15.5kph 10 mph

On average September is the 3rd wettest month of the year in Alamosa with around 24mm 0.9 inches of rain making it a 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 10 hours of sunshine per day.

September temperatures in Alamosa

Alamosa average temperature in September

September rainfall

Alamosa average rain in September

September hourly sunshine

Alamosa 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 Alamosa 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

Alamosa weather stats

Alamosa weather statistics
Hottest month: July 27.3°C 81.1°F
Driest month: January 7mm 0.3ins
Sunniest month: June 12.1hrs
Coldest month: January 0.8°C 33.4°F
Wettest month: July 31mm 1.2ins
Map showing location of Alamosa (37.46945, -105.87002) Alamosa map pin © Google

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