Idaho Falls weather in September 2026

Expect daytime maximum temperatures of 73°F in Idaho Falls, Idaho in September based on long-term weather averages. There are 10 hours of sunshine per day on average.

  • 73°F maximum daytime temperature in September in Idaho Falls73
    73°F max day temperature
  • 10 hours of sunshine per day
  • 6 days with some rainfall in September in Idaho Falls6
    6 days with some rainfall
  • 41°F minimum night-time temperature in September in Idaho Falls41
    41°F min night temperature
  • 12 hours of daylight per day in September in Idaho Falls12
    12 hours of daylight per day
  • No heat & humidity in September in Idaho Falls0
    No heat & humidity
  • 0.9 inches monthly rainfall in September in Idaho Falls0.9
    0.9 inches of monthly rainfall
  • UV (maximum) index 6 (High) in September in Idaho Falls6
    6 (High) UV index

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

Daytime temperatures usually reach 77°F in Idaho Falls in September with no heat and humidity, falling to 46°F at night.

How sunny is it in Idaho Falls in September?

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

Does it rain in Idaho Falls in September?

There are usually 4 days with some rain in Idaho Falls in September and the average monthly rainfall is 0.7 inches.

Idaho Falls September sunrise & sunset times

Browse the sunrise and sunset times for Idaho Falls in September 2026. Select a month to view Idaho Falls sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 05:52 19:03
Tuesday, 15th September 2026 06:08 18:38
Wednesday, 30th September 2026 06:25 18:11

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