Boulder weather in October
October in Boulder: nice, dry, with clean air — an excellent time to visit.
#5 of 12 months in Boulder · #311 of 897 destinations to visit in October · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Boulder in October
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Boulder climate normals — October
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 3°C / 37°F | |
| Rainfall | 29 mm / 1.1 in | ☀️ dry |
| Rainy days | 6 days | |
| Humidity | 55% | 🍃 comfortable |
| Dew point | 0°C / 32°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 11.1 h | |
| Wind | 14 km/h / 9 mph | |
| Snowfall | 12 cm / 4.7 in | |
| Air quality (US AQI) | 28 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Boulder in October — FAQ
- Is October a good time to visit Boulder?
- October in Boulder: nice, dry, with clean air — an excellent time to visit. It ranks #5 of 12 months for Boulder on SeasonMap's comfort score (83/100).
- What is the weather like in Boulder in October?
- In October, Boulder averages a daily high of 17.9°C and a low of 2.5°C, with about 29.1 mm of rain over roughly 6.2 rainy days.
- What is the air quality in Boulder in October?
- Boulder has a mean US Air Quality Index of about 28 in October.
- Does it snow in Boulder in October?
- Boulder sees roughly 12 cm of snowfall in October.