Sun Valley weather in May 2026

Expect daytime maximum temperatures of 16°C in Sun Valley, Idaho in May based on long-term weather averages. There are 9 hours of sunshine per day on average with 11 days with some rainfall and typically 43 mm of rainfall in the month.

  • 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 hot is it in Sun Valley in May?

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

How sunny is it in Sun Valley in May?

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

Does it rain in Sun Valley in May?

There are usually 7 days with some rain in Sun Valley in May and the average monthly rainfall is 27mm.

Sun Valley May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 05:29 19:40
Saturday, 16th May 2026 05:11 19:57
Sunday, 31st May 2026 04:59 20:12

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