Helena weather in May 2020

  • 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 Helena, Montana 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.

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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 sunrise & sunset times for May 2020

Browse the sunrise & sunset times for Helena in May 2020. Select a month to view Helena sunrise & sunset times for the next twelve months.


Date Sunrise times Sunset times
Friday, 1st May 2020 06:13 20:39
Saturday, 16th May 2020 05:52 20:58
Sunday, 31st May 2020 05:39 21:14
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Metric (°C / mm)  |  Imperial (°F / inches)

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Where's hot in Montana in May?

Below are average maximum temperatures at popular destinations in Montana in May. Select a destination to see more weather parameters.

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