Helena weather in August 2025

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

  • 28°C maximum daytime temperature in August in Helena28
    28°C max day temperature
  • 10 hours of sunshine per day
  • 8 days with some rainfall in August in Helena8
    8 days with some rainfall
  • 9°C minimum night-time temperature in August in Helena9
    9°C min night temperature
  • 14 hours of daylight per day in August in Helena14
    14 hours of daylight per day
  • Low heat & humidity in August in HelenaL
    Low heat & humidity
  • 34 mm monthly rainfall in August in Helena34
    34 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Helena8
    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.

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

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How hot is it in Helena in August?

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

How sunny is it in Helena in August?

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

Does it rain in Helena in August?

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

Helena August sunrise & sunset times

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

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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