Boulder weather in July
July in Boulder: hot, a little rain — an excellent time to visit.
#4 of 12 months in Boulder · #285 of 897 destinations to visit in July · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Boulder in July
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Boulder climate normals — July
| Daytime high | 30°C / 86°F | 🥵 hot |
|---|---|---|
| Nighttime low | 15°C / 58°F | |
| Rainfall | 72 mm / 2.8 in | 🌦 some rain |
| Rainy days | 16 days | |
| Humidity | 59% | 🍃 comfortable |
| Dew point | 12°C / 54°F | |
| Sunshine | 13.2 h/day | |
| Daylight | 14.7 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 51 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Boulder in July — FAQ
- Is July a good time to visit Boulder?
- July in Boulder: hot, a little rain — an excellent time to visit. It ranks #4 of 12 months for Boulder on SeasonMap's comfort score (87/100).
- What is the weather like in Boulder in July?
- In July, Boulder averages a daily high of 29.9°C and a low of 14.7°C, with about 71.5 mm of rain over roughly 16.2 rainy days.
- What is the air quality in Boulder in July?
- Boulder has a mean US Air Quality Index of about 51 in July.