Idaho weather in May 2025

Expect 22°C daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Idaho in May. Check more long-term weather averages for Idaho in May before you book your next holiday to Idaho in 2025/2026.

  • 22°C maximum daytime temperature in May in Idaho (Boise)22
    22°C max day temperature
  • 11 hours of sunshine per day
  • 7 days with some rainfall in May in Idaho (Boise)7
    7 days with some rainfall
  • 6°C minimum night-time temperature in May in Idaho (Boise)6
    6°C min night temperature
  • 15 hours of daylight per day in May in Idaho (Boise)15
    15 hours of daylight per day
  • No heat & humidity in May in Idaho (Boise)0
    No heat & humidity
  • 27 mm monthly rainfall in May in Idaho (Boise)27
    27 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Idaho (Boise)7
    7 (High) UV index

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The May weather guide for Idaho (Boise) 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.

Top Idaho destinations

Below are average maximum temperatures at popular countries, regions and places in Idaho in May. Select a holiday destination to see more weather parameters.

All Idaho destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

How hot is it in Idaho in May?

Daytime temperatures usually reach 22°C in Boise, Idaho in May, falling to 6°C at night.

How sunny is it in Idaho in May?

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

Does it rain in Idaho in May?

There are usually 7 days with some rain in Boise, Idaho in May and the average monthly rainfall is 27mm.

Idaho May sunrise & sunset times

Browse the sunrise and sunset times for Idaho in May 2025. Select a month to view Idaho sunrise and sunset times for the next 12 months. The Idaho sunrise and sunset times shown below are for Boise.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:37 19:48
Friday, 16th May 2025 05:18 20:05
Saturday, 31st May 2025 05:07 20:19

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