Montana weather in August 2025

Expect 28°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Montana in August. Check more long-term weather averages for Montana in August before you book your next holiday to Montana in 2025/2026.

  • 28°C maximum daytime temperature in August in Montana (Helena)28
    28°C max day temperature
  • 10 hours of sunshine per day
  • 8 days with some rainfall in August in Montana (Helena)8
    8 days with some rainfall
  • 9°C minimum night-time temperature in August in Montana (Helena)9
    9°C min night temperature
  • 14 hours of daylight per day in August in Montana (Helena)14
    14 hours of daylight per day
  • Low heat & humidity in August in Montana (Helena)L
    Low heat & humidity
  • 34 mm monthly rainfall in August in Montana (Helena)34
    34 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Montana (Helena)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.

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

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How hot is it in Montana in August?

Daytime temperatures usually reach 28°C in Helena, Montana in August with low heat and humidity, falling to 9°C at night.

How sunny is it in Montana in August?

There are normally 10 hours of bright sunshine each day in Helena, Montana in August - that's 73% of daylight hours.

Does it rain in Montana in August?

There are usually 8 days with some rain in Helena, Montana in August and the average monthly rainfall is 34mm.

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.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:09 19:59
Saturday, 16th August 2025 05:28 19:36
Sunday, 31st August 2025 05:47 19:08

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