Lewiston weather in August 2025

Expect 88°F daytime maximum temperatures in the shade with on average 12 hours of sunshine per day in Lewiston in August. Check more long-term weather averages for Lewiston in August before you book your next holiday to Idaho in 2025/2026.

  • 88°F maximum daytime temperature in August in Lewiston88
    88°F max day temperature
  • 12 hours of sunshine per day
  • 5 days with some rainfall in August in Lewiston5
    5 days with some rainfall
  • 55°F minimum night-time temperature in August in Lewiston55
    55°F min night temperature
  • 14 hours of daylight per day in August in Lewiston14
    14 hours of daylight per day
  • Moderate heat & humidity in August in LewistonM
    Moderate heat & humidity
  • 0.8 inches monthly rainfall in August in Lewiston0.8
    0.8 inches of monthly rainfall
  • UV (maximum) index 7 (High) in August in Lewiston7
    7 (High) UV index

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The August weather guide for Idaho (Lewiston) 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 Lewiston in August?

Daytime temperatures usually reach 88°F in Lewiston in August with moderate heat and humidity, falling to 55°F at night.

How sunny is it in Lewiston in August?

There are normally 12 hours of bright sunshine each day in Lewiston in August - that's 87% of daylight hours.

Does it rain in Lewiston in August?

There are usually 5 days with some rain in Lewiston in August and the average monthly rainfall is 0.8 inches.

Lewiston August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:30 19:18
Saturday, 16th August 2025 04:48 18:55
Sunday, 31st August 2025 05:07 18:28

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