Boise weather in August 2026

Expect daytime maximum temperatures of 88°F in Boise, Idaho in August based on long-term weather averages. There are 12 hours of sunshine per day on average.

  • 88°F maximum daytime temperature in August in Boise88
    88°F max day temperature
  • 12 hours of sunshine per day
  • 3 days with some rainfall in August in Boise3
    3 days with some rainfall
  • 55°F minimum night-time temperature in August in Boise55
    55°F min night temperature
  • 14 hours of daylight per day in August in Boise14
    14 hours of daylight per day
  • Moderate heat & humidity in August in BoiseM
    Moderate heat & humidity
  • 0.4 inches monthly rainfall in August in Boise0.4
    0.4 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Boise8
    8 (Very High) UV index

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The August 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.

Metric (°C)  |  Imperial (°F)

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How hot is it in Boise in August?

Daytime temperatures usually reach 88°F in Boise in August with moderate heat and humidity, falling to 55°F at night.

How sunny is it in Boise in August?

There are normally 12 hours of bright sunshine each day in Boise in August - that's 83% of daylight hours.

Does it ever rain in Boise in August?

There are usually 3 days with some rain in Boise in August and the average monthly rainfall is 0.4 inches.

Boise August sunrise & sunset times

Browse the sunrise and sunset times for Boise in August 2026. Select a month to view Boise sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st August 2026 05:34 20:07
Sunday, 16th August 2026 05:51 19:47
Monday, 31st August 2026 06:08 19:22

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