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Helena weather in May 2025
Expect 18°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Helena in May. Check more long-term weather averages for Helena in May before you book your next holiday to Montana in 2025/2026.
- 1818°C max day temperature
- 9 hours of sunshine per day
- 1111 days with some rainfall
- 33°C min night temperature
- 1515 hours of daylight per day
- 0No heat & humidity
- 5151 mm of monthly rainfall
- 77 (High) UV index
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The May 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 May?
Daytime temperatures usually reach 18°C in Helena in May, falling to 3°C at night.
How sunny is it in Helena in May?
There are normally 9 hours of bright sunshine each day in Helena in May - that's 60% of daylight hours.
Does it rain in Helena in May?
There are usually 11 days with some rain in Helena in May and the average monthly rainfall is 51mm.
Helena May sunrise & sunset times
Browse the sunrise and sunset times for Helena in May 2025. Select a month to view Helena sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Thursday, 1st May 2025 | 05:13 | 19:38 |
Friday, 16th May 2025 | 04:52 | 19:57 |
Saturday, 31st May 2025 | 04:39 | 20:13 |
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