Lewistown weather in May 2025

Expect 17°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Lewistown in May. Check more long-term weather averages for Lewistown in May before you book your next holiday to Montana in 2025/2026.

  • 17°C maximum daytime temperature in May in Lewistown17
    17°C max day temperature
  • 10 hours of sunshine per day
  • 11 days with some rainfall in May in Lewistown11
    11 days with some rainfall
  • 3°C minimum night-time temperature in May in Lewistown3
    3°C min night temperature
  • 15 hours of daylight per day in May in Lewistown15
    15 hours of daylight per day
  • No heat & humidity in May in Lewistown0
    No heat & humidity
  • 82 mm monthly rainfall in May in Lewistown82
    82 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Lewistown7
    7 (High) UV index

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The May weather guide for Montana (Lewistown) 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 warm is it in Lewistown in May?

Daytime temperatures usually reach 17°C in Lewistown in May, falling to 3°C at night.

How sunny is it in Lewistown in May?

There are normally 10 hours of bright sunshine each day in Lewistown in May - that's 64% of daylight hours.

Does it rain in Lewistown in May?

There are usually 11 days with some rain in Lewistown in May and the average monthly rainfall is 82mm.

Lewistown May sunrise & sunset times

Browse the sunrise and sunset times for Lewistown in May 2025. Select a month to view Lewistown sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:01 19:29
Friday, 16th May 2025 04:41 19:49
Saturday, 31st May 2025 04:27 20:05

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