Lewistown weather in August 2025

Expect 81°F daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Lewistown in August. Check more long-term weather averages for Lewistown in August before you book your next holiday to Montana in 2025/2026.

  • 81°F maximum daytime temperature in August in Lewistown81
    81°F max day temperature
  • 11 hours of sunshine per day
  • 7 days with some rainfall in August in Lewistown7
    7 days with some rainfall
  • 50°F minimum night-time temperature in August in Lewistown50
    50°F min night temperature
  • 14 hours of daylight per day in August in Lewistown14
    14 hours of daylight per day
  • Low heat & humidity in August in LewistownL
    Low heat & humidity
  • 1.8 inches monthly rainfall in August in Lewistown1.8
    1.8 inches of monthly rainfall
  • UV (maximum) index 7 (High) in August in Lewistown7
    7 (High) UV index

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The August 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)  |  Imperial (°F)

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How hot is it in Lewistown in August?

Daytime temperatures usually reach 81°F in Lewistown in August with low heat and humidity, falling to 50°F at night.

How sunny is it in Lewistown in August?

There are normally 11 hours of bright sunshine each day in Lewistown in August - that's 76% of daylight hours.

Does it rain in Lewistown in August?

There are usually 7 days with some rain in Lewistown in August and the average monthly rainfall is 1.8 inches.

Lewistown August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:57 19:50
Saturday, 16th August 2025 05:17 19:26
Sunday, 31st August 2025 05:36 18:59

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