Montana weather in August 2025

Expect daytime maximum temperatures of 28°C in Montana in August based on long-term weather averages. There are 10 hours of sunshine per day on average.

• 28
  28°C max day temperature
• 10
  10 hours of sunshine per day
• 8
  8 days with some rainfall
• 9
  9°C min night temperature
• 14
  14 hours of daylight per day
• L
  Low heat & humidity
• 34
  34 mm of monthly rainfall
• 8
  8 (Very High) UV index

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The August weather guide for Montana (Helena) 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.

Top Montana destinations

Below are average maximum temperatures at popular countries, regions and places in Montana in August. Select a holiday destination to see more weather parameters.

• 30
  Billings
• 28
  Great Falls
• 28
  Missoula
• 27
  Bozeman
• 26
  Whitefish
• 23
  West Yellowstone

All Montana destinations

• Billings
• Bozeman
• Butte
• East Glacier Park
• Glasgow
• Great Falls
• Hamilton
• Havre
• Helena
• Kalispell
• Lewistown
• Miles City
• Missoula
• West Yellowstone
• Whitefish

Metric (°C / mm)  |  Imperial (°F / inches)

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Montana August sunrise & sunset times

Browse the sunrise and sunset times for Montana in August 2025. Select a month to view Montana sunrise and sunset times for the next 12 months. The Montana sunrise and sunset times shown below are for Helena.

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