West Yellowstone weather in August 2025

Expect 73°F daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in West Yellowstone in August. Check more long-term weather averages for West Yellowstone in August before you book your next holiday to Montana in 2025/2026.

  • 73°F maximum daytime temperature in August in West Yellowstone73
    73°F max day temperature
  • 10 hours of sunshine per day
  • 8 days with some rainfall in August in West Yellowstone8
    8 days with some rainfall
  • 39°F minimum night-time temperature in August in West Yellowstone39
    39°F min night temperature
  • 14 hours of daylight per day in August in West Yellowstone14
    14 hours of daylight per day
  • No heat & humidity in August in West Yellowstone0
    No heat & humidity
  • 1.6 inches monthly rainfall in August in West Yellowstone1.6
    1.6 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in West Yellowstone8
    8 (Very High) UV index

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The August weather guide for Montana (West Yellowstone) 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 West Yellowstone in August?

Daytime temperatures usually reach 73°F in West Yellowstone in August, falling to 39°F at night.

How sunny is it in West Yellowstone in August?

There are normally 10 hours of bright sunshine each day in West Yellowstone in August - that's 72% of daylight hours.

Does it rain in West Yellowstone in August?

There are usually 8 days with some rain in West Yellowstone in August and the average monthly rainfall is 1.6 inches.

West Yellowstone August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:11 19:50
Saturday, 16th August 2025 05:29 19:28
Sunday, 31st August 2025 05:46 19:02

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