Boise weather in August 2025

Expect 88°F 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.

  • 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

More about Boise

Boise by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Idaho

  • Compare car hire prices to find lowest rate
  • Free cancellation up to 48 hours before pick up
  • Book car hire for over 20,000 destinations worldwide

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)

Back to top

More about the USA

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 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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^