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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.
- 2828°C max day temperature
- 10 hours of sunshine per day
- 88 days with some rainfall
- 99°C min night temperature
- 1414 hours of daylight per day
- LLow heat & humidity
- 3434 mm of monthly rainfall
- 88 (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)
More about the USA
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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