Lewiston weather in August 2026

Expect daytime maximum temperatures of 31°C in Lewiston, Idaho in August based on long-term weather averages. There are 12 hours of sunshine per day on average.

  • 31°C maximum daytime temperature in August in Lewiston31
    31°C max day temperature
  • 12 hours of sunshine per day
  • 5 days with some rainfall in August in Lewiston5
    5 days with some rainfall
  • 13°C minimum night-time temperature in August in Lewiston13
    13°C 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
  • 21 mm monthly rainfall in August in Lewiston21
    21 mm 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Lewiston in August?

Daytime temperatures usually reach 31°C in Lewiston in August with moderate heat and humidity, falling to 13°C 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 83% of daylight hours.

Does it ever rain in Lewiston in August?

There are usually 3 days with some rain in Lewiston in August and the average monthly rainfall is 10mm.

Lewiston August sunrise & sunset times

Browse the sunrise and sunset times for Lewiston in August 2026. Select a month to view Lewiston sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st August 2026 04:29 19:18
Sunday, 16th August 2026 04:48 18:56
Monday, 31st August 2026 05:07 18:28

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