Great Falls weather in August 2025

Expect 28°C daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Great Falls in August. Check more long-term weather averages for Great Falls in August before you book your next holiday to Montana in 2025/2026.

  • 28°C maximum daytime temperature in August in Great Falls28
    28°C max day temperature
  • 11 hours of sunshine per day
  • 8 days with some rainfall in August in Great Falls8
    8 days with some rainfall
  • 11°C minimum night-time temperature in August in Great Falls11
    11°C min night temperature
  • 14 hours of daylight per day in August in Great Falls14
    14 hours of daylight per day
  • Low heat & humidity in August in Great FallsL
    Low heat & humidity
  • 36 mm monthly rainfall in August in Great Falls36
    36 mm of monthly rainfall
  • UV (maximum) index 7 (High) in August in Great Falls7
    7 (High) UV index

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The August weather guide for Montana (Great Falls) 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 Great Falls in August?

Daytime temperatures usually reach 28°C in Great Falls in August with low heat and humidity, falling to 11°C at night.

How sunny is it in Great Falls in August?

There are normally 11 hours of bright sunshine each day in Great Falls in August - that's 75% of daylight hours.

Does it rain in Great Falls in August?

There are usually 8 days with some rain in Great Falls in August and the average monthly rainfall is 36mm.

Great Falls August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:04 19:59
Saturday, 16th August 2025 05:23 19:35
Sunday, 31st August 2025 05:43 19:07

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