Idaho Falls weather in May 2026

Expect daytime maximum temperatures of 66°F in Idaho Falls, Idaho in May based on long-term weather averages. There are 10 hours of sunshine per day on average with 10 days with some rainfall.

  • 66°F maximum daytime temperature in May in Idaho Falls66
    66°F max day temperature
  • 10 hours of sunshine per day
  • 10 days with some rainfall in May in Idaho Falls10
    10 days with some rainfall
  • 39°F minimum night-time temperature in May in Idaho Falls39
    39°F min night temperature
  • 15 hours of daylight per day in May in Idaho Falls15
    15 hours of daylight per day
  • No heat & humidity in May in Idaho Falls0
    No heat & humidity
  • 1.4 inches monthly rainfall in May in Idaho Falls1.4
    1.4 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in May in Idaho Falls8
    8 (Very High) UV index

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The May 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 May?

Daytime temperatures usually reach 72°F in Idaho Falls in May, falling to 43°F at night.

How sunny is it in Idaho Falls in May?

There are normally 11 hours of bright sunshine each day in Idaho Falls in May - that's 73% of daylight hours.

Does it rain in Idaho Falls in May?

There are usually 7 days with some rain in Idaho Falls in May and the average monthly rainfall is 1.1 inches.

Idaho Falls May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 05:21 19:31
Saturday, 16th May 2026 05:02 19:47
Sunday, 31st May 2026 04:51 20:02

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