Montana weather in May 2025

Expect 18°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Montana in May. Check more long-term weather averages for Montana in May before you book your next holiday to Montana in 2025/2026.

  • 18°C maximum daytime temperature in May in Montana (Helena)18
    18°C max day temperature
  • 9 hours of sunshine per day
  • 11 days with some rainfall in May in Montana (Helena)11
    11 days with some rainfall
  • 3°C minimum night-time temperature in May in Montana (Helena)3
    3°C min night temperature
  • 15 hours of daylight per day in May in Montana (Helena)15
    15 hours of daylight per day
  • No heat & humidity in May in Montana (Helena)0
    No heat & humidity
  • 51 mm monthly rainfall in May in Montana (Helena)51
    51 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Montana (Helena)7
    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.

Top Montana destinations

Below are average maximum temperatures at popular countries, regions and places in Montana in May. Select a holiday destination to see more weather parameters.

All Montana destinations

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

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How hot is it in Montana in May?

Daytime temperatures usually reach 18°C in Helena, Montana in May, falling to 3°C at night.

How sunny is it in Montana in May?

There are normally 9 hours of bright sunshine each day in Helena, Montana in May - that's 60% of daylight hours.

Does it rain in Montana in May?

There are usually 11 days with some rain in Helena, Montana in May and the average monthly rainfall is 51mm.

Montana May sunrise & sunset times

Browse the sunrise and sunset times for Montana in May 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
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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