Twin Falls weather in September 2025

Expect 77°F daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Twin Falls in September. Check more long-term weather averages for Twin Falls in September before you book your next holiday to Idaho in 2025/2026.

  • 77°F maximum daytime temperature in September in Twin Falls77
    77°F max day temperature
  • 10 hours of sunshine per day
  • 5 days with some rainfall in September in Twin Falls5
    5 days with some rainfall
  • 45°F minimum night-time temperature in September in Twin Falls45
    45°F min night temperature
  • 12 hours of daylight per day in September in Twin Falls12
    12 hours of daylight per day
  • No heat & humidity in September in Twin Falls0
    No heat & humidity
  • 0.6 inches monthly rainfall in September in Twin Falls0.6
    0.6 inches of monthly rainfall
  • UV (maximum) index 6 (High) in September in Twin Falls6
    6 (High) UV index

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The September weather guide for Idaho (Twin Falls) 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 Twin Falls in September?

Daytime temperatures usually reach 77°F in Twin Falls in September with no heat and humidity, falling to 45°F at night.

How sunny is it in Twin Falls in September?

There are normally 10 hours of bright sunshine each day in Twin Falls in September - that's 80% of daylight hours.

Does it rain in Twin Falls in September?

There are usually 5 days with some rain in Twin Falls in September and the average monthly rainfall is 0.6 inches.

Twin Falls September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:03 19:11
Monday, 15th September 2025 06:18 18:47
Tuesday, 30th September 2025 06:34 18:20

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