Boise weather in August 2025

Expect 31°C daytime maximum temperatures in the shade with on average 12 hours of sunshine per day in Boise in August. Check more long-term weather averages for Boise in August before you book your next holiday to Idaho in 2025/2026.

  • 31°C maximum daytime temperature in August in Boise31
    31°C max day temperature
  • 12 hours of sunshine per day
  • 3 days with some rainfall in August in Boise3
    3 days with some rainfall
  • 13°C minimum night-time temperature in August in Boise13
    13°C 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
  • 10 mm monthly rainfall in August in Boise10
    10 mm 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Boise in August?

Daytime temperatures usually reach 31°C in Boise in August with moderate heat and humidity, falling to 13°C 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 10mm.

Boise August sunrise & sunset times

Browse the sunrise and sunset times for Boise in August 2025. Select a month to view Boise sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:35 20:07
Saturday, 16th August 2025 05:51 19:46
Sunday, 31st August 2025 06:08 19:21

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