Nampa Climate by Month
Nampa, Idaho, United States
Hot summers and cold winters, with little rain.
Hot summers and cold winters, with little rain: that's Nampa's climate in short. Afternoon highs range from 39°F (4°C) in January to 92°F (34°C) in July, and January nights average 24°F (-4°C). It gets only 9.4 in (239 mm) of rain a year. July and August are almost completely dry.
- Warmest month
- 92°F(34°C)
- Average high, July
- Coldest nights
- 24°F(-4°C)
- Average low, January
- Rain per year
- 9.4 in(239 mm)
- No clear rainy season
- Humidity
- 54%
- Sunniest: July
Best and worst months in Nampa
Best for weatherMay and September are the best time for weather in Nampa: highs near 77°F (25°C) and about 0.7 in (19 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 39°F (4°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)
Nampa weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 39°F(4°C) | 24°F(-4°C) | 1.1 in(29 mm) | 83% | 1.5 |
| FebFebruary | 46°F(8°C) | 28°F(-2°C) | 0.7 in(19 mm) | 67% | 2.6 |
| MarMarch | 57°F(14°C) | 34°F(1°C) | 1.0 in(26 mm) | 57% | 3.9 |
| AprApril | 65°F(18°C) | 38°F(4°C) | 1.0 in(26 mm) | 46% | 5.2 |
| MayMayBest | 74°F(23°C) | 46°F(8°C) | 1.1 in(27 mm) | 45% | 6.4 |
| JunJune | 82°F(28°C) | 53°F(12°C) | 0.7 in(19 mm) | 39% | 7.2 |
| JulJuly | 92°F(34°C) | 60°F(15°C) | 0.2 in(4 mm) | 33% | 7.7 |
| AugAugust | 91°F(33°C) | 57°F(14°C) | 0.2 in(4 mm) | 31% | 6.7 |
| SepSeptemberBest | 81°F(27°C) | 48°F(9°C) | 0.4 in(10 mm) | 39% | 5.1 |
| OctOctober | 66°F(19°C) | 38°F(3°C) | 0.7 in(18 mm) | 52% | 3.3 |
| NovNovember | 51°F(10°C) | 29°F(-1°C) | 1.0 in(26 mm) | 72% | 1.9 |
| DecDecember | 40°F(4°C) | 24°F(-4°C) | 1.2 in(31 mm) | 82% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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