Lewiston, ID Weather & Climate Normals
Lewiston's real weather, in one number
Lewiston, ID scores 38/100 on this site's reading of NOAA's own 30-year normals: weather-driven. Heat, cold, snow, or rainfall here are heavy enough that they shape daily life for a large part of the year. 3 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Lewiston's hottest and coldest months
Lewiston's hottest month is Jul, averaging 76°F; its coldest is Dec, averaging 35°F, a 40.7°F swing across the year, a middling gap by national standards.
Lewiston's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 42°F | 30°F | 1.13in | 2.7in |
| Feb | 47°F | 32°F | 1.04in | 3.8in |
| Mar | 55°F | 36°F | 1.3in | 0.8in |
| Apr | 62°F | 41°F | 1.44in | 0in |
| May | 72°F | 48°F | 1.69in | 0in |
| Jun | 79°F | 54°F | 1.25in | 0in |
| Jul | 91°F | 61°F | 0.47in | 0in |
| Aug | 90°F | 60°F | 0.51in | 0in |
| Sep | 80°F | 52°F | 0.6in | 0in |
| Oct | 63°F | 42°F | 1.08in | 0in |
| Nov | 49°F | 35°F | 1.23in | 1.3in |
| Dec | 41°F | 30°F | 1.13in | 4.1in |
May, Jun, and Sep are the best time to see Lewiston at its mildest; the rest of the year, plan around Jul's heat and Dec's cold.
Rain and snow in Lewiston
Lewiston averages 12.87in of precipitation a year across roughly 106 days with measurable rain or snow, and 12.7in of snow a year.
Where Lewiston ranks
Lewiston ranks 4696 of 4876 US cities in this dataset for comfort score, and 31 of 36 within ID. About 34,693 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Lewiston Nez Perce Co Ap, ID US, 1.7 miles from Lewiston, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure