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.

  • 18°C maximum daytime temperature in May in Helena18
    18°C max day temperature
  • 9 hours of sunshine per day
  • 11 days with some rainfall in May in Helena11
    11 days with some rainfall
  • 3°C minimum night-time temperature in May in Helena3
    3°C min night temperature
  • 15 hours of daylight per day in May in Helena15
    15 hours of daylight per day
  • No heat & humidity in May in Helena0
    No heat & humidity
  • 51 mm monthly rainfall in May in Helena51
    51 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Helena7
    7 (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)

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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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