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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 max day temperature
31 - 12 hours of sunshine per day
- 5 days with some rainfall
5 - 13°C min night temperature
13 - 14 hours of daylight per day
14 - Moderate heat & humidity
M - 21 mm of monthly rainfall
21 - 7 (High) UV index
7
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Recommended for Idaho
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)
More about the USA
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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