Weather in Boise
What's the weather like in Boise?
Boise has a wide swing between hot summers and cold winters and low overall rainfall. Average daytime highs range from 4°C (40°F) in January to 35°C (95°F) in July, with overnight lows around -4°C (26°F) and 19°C (65°F) respectively.
For comfortable sightseeing temperatures (18–26°C daytime highs), the best months to visit Boise are May, and September through October.
Quick facts
- Country
- 🇺🇸 United States
- Region
- North America
- Time zone
- America/Boise
- Coordinates
- 43.615, -116.202
Monthly climate
Long-run averages for each month of the year.
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 4°C / 40°F | -4°C / 26°F | 43 mm | 10 | — |
| February | 8°C / 46°F | -2°C / 29°F | 38 mm | 9 | — |
| March | 13°C / 56°F | 2°C / 35°F | 39 mm | 9 | — |
| April | 18°C / 64°F | 4°C / 40°F | 31 mm | 7 | — |
| May | 23°C / 74°F | 9°C / 48°F | 39 mm | 8 | — |
| June | 29°C / 84°F | 14°C / 57°F | 22 mm | 3 | — |
| July | 35°C / 95°F | 19°C / 65°F | 2 mm | 1 | — |
| August | 34°C / 92°F | 18°C / 64°F | 5 mm | 1 | — |
| September | 28°C / 82°F | 13°C / 55°F | 15 mm | 3 | — |
| October | 19°C / 66°F | 7°C / 44°F | 26 mm | 5 | — |
| November | 10°C / 50°F | 0°C / 33°F | 37 mm | 8 | — |
| December | 4°C / 39°F | -3°C / 26°F | 55 mm | 12 | — |
Boise by month
Detailed weather for any specific month:
Seasonal patterns to know
Atlantic hurricane season runs June–November (peak August–October). Tropical storms and hurricanes are possible — peak risk is August–October.
Cities with a similar climate to Boise
Frequently asked questions
When is the best time to visit Boise?
The most comfortable months in Boise are usually May, September, October, when average highs sit near 18–26°C (64–79°F) with relatively little rain. See the full month-by-month breakdown for the exact figures.
What is the hottest month in Boise?
July is typically the hottest month in Boise, averaging a high of 35°C (95°F).
What is the coldest month in Boise?
January is usually the coldest, with average lows around -4°C (26°F).
Does it snow in Boise?
Snow is rare in Boise; the climate data shows essentially no snowfall across the year.
Live forecast, sunrise/sunset, and more.