Boulder weather in January
January in Boulder: cold, dry, with clean air — a fair time to visit.
#12 of 12 months in Boulder · #707 of 897 destinations to visit in January · comfort 53/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Boulder in January
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Boulder climate normals — January
| Daytime high | 4°C / 40°F | 🧥 cold |
|---|---|---|
| Nighttime low | -9°C / 15°F | |
| Rainfall | 28 mm / 1.1 in | ☀️ dry |
| Rainy days | 6 days | |
| Humidity | 73% | 💧 humid |
| Dew point | -10°C / 14°F | |
| Sunshine | 7.8 h/day | |
| Daylight | 9.7 h | |
| Wind | 14 km/h / 9 mph | |
| Snowfall | 21.9 cm / 8.6 in | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Boulder in January — FAQ
- Is January a good time to visit Boulder?
- January in Boulder: cold, dry, with clean air — a fair time to visit. It ranks #12 of 12 months for Boulder on SeasonMap's comfort score (53/100).
- What is the weather like in Boulder in January?
- In January, Boulder averages a daily high of 4.2°C and a low of -9.3°C, with about 27.6 mm of rain over roughly 6.4 rainy days.
- What is the air quality in Boulder in January?
- Boulder has a mean US Air Quality Index of about 42 in January.
- Does it snow in Boulder in January?
- Boulder sees roughly 21.9 cm of snowfall in January.