Sun Valley weather in May 2025

Expect 16°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Sun Valley in May. Check more long-term weather averages for Sun Valley in May before you book your next holiday to Idaho in 2025/2026.

  • 16°C maximum daytime temperature in May in Sun Valley16
    16°C max day temperature
  • 9 hours of sunshine per day
  • 11 days with some rainfall in May in Sun Valley11
    11 days with some rainfall
  • -1°C minimum night-time temperature in May in Sun Valley-1
    -1°C min night temperature
  • 15 hours of daylight per day in May in Sun Valley15
    15 hours of daylight per day
  • No heat & humidity in May in Sun Valley0
    No heat & humidity
  • 43 mm monthly rainfall in May in Sun Valley43
    43 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in May in Sun Valley8
    8 (Very High) UV index

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The May weather guide for Idaho (Sun Valley) 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 / mm)  |  Imperial (°F / inches)

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How warm is it in Sun Valley in May?

Daytime temperatures usually reach 16°C in Sun Valley in May, falling to -1°C at night.

How sunny is it in Sun Valley in May?

There are normally 9 hours of bright sunshine each day in Sun Valley in May - that's 63% of daylight hours.

Does it rain in Sun Valley in May?

There are usually 11 days with some rain in Sun Valley in May and the average monthly rainfall is 43mm.

Sun Valley May sunrise & sunset times

Browse the sunrise and sunset times for Sun Valley in May 2025. Select a month to view Sun Valley sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:29 19:41
Friday, 16th May 2025 05:11 19:58
Saturday, 31st May 2025 04:59 20:12

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