Boise weather in January
January in Boise: cold, a little rain, with clean air — a fair time to visit.
#11 of 12 months in Boise · #435 of 604 destinations to visit in January · comfort 55/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Boise climate normals — January
| Daytime high | 5°C / 41°F | 🧥 cold |
|---|---|---|
| Nighttime low | -3°C / 26°F | |
| Feels like (high) | 1°C / 34°F | |
| Rainfall | 41 mm / 1.6 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 75% | 💦 very humid |
| Dew point | -6°C / 22°F | |
| Sunshine | 6.6 h/day | |
| Daylight | 9.4 h | |
| Wind | 18 km/h / 11 mph | |
| Snowfall | 7.9 cm / 3.1 in | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Boise?
Loading map…
Boise in January — FAQ
- Is January a good time to visit Boise?
- January in Boise: cold, a little rain, with clean air — a fair time to visit. It ranks #11 of 12 months for Boise on SeasonMap's comfort score (55/100).
- What is the weather like in Boise in January?
- In January, Boise averages a daily high of 5°C and a low of -3.4°C, with about 40.8 mm of rain over roughly 8.8 rainy days.
- What is the air quality in Boise in January?
- Boise has a mean US Air Quality Index of about 33 in January.
- Does it snow in Boise in January?
- Boise sees roughly 7.9 cm of snowfall in January.