Lewiston, Idaho Climate by Month
Lewiston, Idaho, United States
Hot summers and cool winters, with little rain.
Hot summers and cool winters, with little rain: that's Lewiston's climate in short. Expect highs of 93°F (34°C) in July and 42°F (6°C) in December, with the coldest nights (December) near 30°F (-1°C). It gets only 13 in (318 mm) of rain a year.
- Warmest month
- 93°F(34°C)
- Average high, July
- Coldest nights
- 30°F(-1°C)
- Average low, December
- Rain per year
- 13 in(318 mm)
- No clear rainy season
- Humidity
- 60%
- Sunniest: July
Best and worst months in Lewiston
Best for weatherThe most comfortable weather comes in May and September, with highs around 77°F (25°C) and about 1.0 in (26 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 42°F (6°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Lewiston weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 42°F(6°C) | 31°F(-1°C) | 1.3 in(32 mm) | 82% | 1.2 |
| FebFebruary | 48°F(9°C) | 32°F(0°C) | 1.1 in(28 mm) | 71% | 2.2 |
| MarMarch | 57°F(14°C) | 37°F(3°C) | 1.3 in(34 mm) | 64% | 3.4 |
| AprApril | 64°F(18°C) | 41°F(5°C) | 1.3 in(33 mm) | 60% | 4.8 |
| MayMayBest | 73°F(23°C) | 48°F(9°C) | 1.5 in(37 mm) | 56% | 5.9 |
| JunJune | 82°F(28°C) | 55°F(13°C) | 1.1 in(27 mm) | 47% | 6.6 |
| JulJuly | 93°F(34°C) | 60°F(16°C) | 0.4 in(10 mm) | 35% | 7.3 |
| AugAugust | 92°F(33°C) | 58°F(15°C) | 0.4 in(11 mm) | 37% | 6.3 |
| SepSeptemberBest | 80°F(27°C) | 50°F(10°C) | 0.6 in(15 mm) | 47% | 4.5 |
| OctOctober | 65°F(18°C) | 40°F(5°C) | 1.1 in(27 mm) | 59% | 2.6 |
| NovNovember | 51°F(10°C) | 36°F(2°C) | 1.3 in(33 mm) | 74% | 1.4 |
| DecDecember | 42°F(6°C) | 30°F(-1°C) | 1.2 in(31 mm) | 83% | 1.0 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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