Alamosa weather in September 2025

Expect 73°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Alamosa in September. Check more long-term weather averages for Alamosa in September before you book your next holiday to Colorado in 2025/2026.

  • 73°F maximum daytime temperature in September in Alamosa73
    73°F max day temperature
  • 9 hours of sunshine per day
  • 6 days with some rainfall in September in Alamosa6
    6 days with some rainfall
  • 37°F minimum night-time temperature in September in Alamosa37
    37°F min night temperature
  • 12 hours of daylight per day in September in Alamosa12
    12 hours of daylight per day
  • No heat & humidity in September in Alamosa0
    No heat & humidity
  • 0.9 inches monthly rainfall in September in Alamosa0.9
    0.9 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Alamosa8
    8 (Very High) UV index

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The September weather guide for Colorado (Alamosa) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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How hot is it in Alamosa in September?

Daytime temperatures usually reach 73°F in Alamosa in September, falling to 37°F at night.

How sunny is it in Alamosa in September?

There are normally 9 hours of bright sunshine each day in Alamosa in September - that's 75% of daylight hours.

Does it rain in Alamosa in September?

There are usually 6 days with some rain in Alamosa in September and the average monthly rainfall is 0.9 inches.

Alamosa September sunrise & sunset times

Browse the sunrise and sunset times for Alamosa in September 2025. Select a month to view Alamosa sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:34 18:32
Monday, 15th September 2025 05:46 18:11
Tuesday, 30th September 2025 05:58 17:48

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