United States of America
Lewiston sees feels-like daytime highs peak around 30.4°C in July and nighttime lows bottom out near -11.4°C in January. October is the wettest month (~107 mm), while January is the driest (~31 mm). For sunshine, August leads with about 61% clear skies.
Based on mild feels-like temperatures and low rain chances, the most comfortable months are June, August, and September — expect around 14.9–26°C with roughly 35% chance of rain on a given day in June.
| Month | Low / High °C | Rain % | Rainfall | Clear skies | Wind |
|---|---|---|---|---|---|
| January | -11.4° / -3.2° | 5% | 31 mm | 47% | 10.1 kph |
| February | -10.3° / -2.1° | 7% | 34 mm | 47% | 10.9 kph |
| March | -4.5° / 3.3° | 14% | 60 mm | 45% | 10.7 kph |
| April | 2.4° / 11.3° | 24% | 84 mm | 45% | 9.3 kph |
| May | 8.7° / 19.2° | 31% | 92 mm | 44% | 7.8 kph |
| June☀ | 14.9° / 26° | 35% | 91 mm | 50% | 6.7 kph |
| July | 18.8° / 30.4° | 37% | 84 mm | 57% | 6.3 kph |
| August☀ | 17.5° / 29° | 31% | 81 mm | 61% | 6.4 kph |
| September☀ | 12.4° / 23.1° | 27% | 86 mm | 61% | 7 kph |
| October | 5.2° / 14.4° | 27% | 107 mm | 57% | 8 kph |
| November | -1.3° / 5.8° | 21% | 91 mm | 49% | 8.6 kph |
| December | -7.7° / -0.9° | 10% | 55 mm | 46% | 9.2 kph |
Feels-like temperatures from long-term historical data; ☀ marks the most comfortable months (mild temperatures, low rain).
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