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Get the Boise ID weather forecast without ads, cookies, or tracking. Open-Meteo data, 10-day forecast, hourly conditions, and radar — all free. click here to hide this
July is the hottest month in Boise ID, with an average high of 93°F / 34°C; January is the coldest (39°F / 4°C). December is the wettest month, averaging 1.5 in / 39 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 39 / 4 | 25 / -4 | 1.4 / 36 | 8 |
| Feb | 46 / 8 | 29 / -2 | 1.0 / 25 | 6 |
| Mar | 55 / 13 | 35 / 1 | 1.3 / 34 | 7 |
| Apr | 62 / 17 | 39 / 4 | 1.2 / 31 | 7 |
| May | 72 / 22 | 47 / 8 | 1.5 / 37 | 6 |
| Jun | 81 / 27 | 54 / 12 | 0.7 / 19 | 3 |
| Jul | 93 / 34 | 62 / 16 | 0.2 / 5 | 1 |
| Aug | 91 / 33 | 61 / 16 | 0.2 / 4 | 1 |
| Sep | 80 / 27 | 52 / 11 | 0.4 / 11 | 2 |
| Oct | 65 / 18 | 41 / 5 | 0.8 / 21 | 4 |
| Nov | 49 / 9 | 31 / 0 | 1.2 / 30 | 7 |
| Dec | 39 / 4 | 25 / -4 | 1.5 / 39 | 8 |
Extremes since 1931: highest 111°F / 44°C (July 28, 1934), lowest -25°F / -32°C (December 22, 1990).
Daylight lasts about 15.3 hours in June and 8.7 hours in December.
Data: Meteostat — Boise Air Terminal, 1991–2020 averages.
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