Boulder weather in June
June in Boulder: warm, rainy, with clean air — an excellent time to visit.
#3 of 12 months in Boulder · #178 of 897 destinations to visit in June · comfort 90/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Boulder in June
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Boulder climate normals — June
| Daytime high | 26°C / 79°F | 🌤 warm |
|---|---|---|
| Nighttime low | 11°C / 51°F | |
| Rainfall | 87 mm / 3.4 in | 🌧 rainy |
| Rainy days | 17 days | |
| Humidity | 61% | 💧 humid |
| Dew point | 9°C / 48°F | |
| Sunshine | 13 h/day | |
| Daylight | 15 h | |
| Wind | 14 km/h / 8 mph | |
| Snowfall | 0.9 cm / 0.4 in | |
| Air quality (US AQI) | 44 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Boulder in June — FAQ
- Is June a good time to visit Boulder?
- June in Boulder: warm, rainy, with clean air — an excellent time to visit. It ranks #3 of 12 months for Boulder on SeasonMap's comfort score (90/100).
- What is the weather like in Boulder in June?
- In June, Boulder averages a daily high of 26.2°C and a low of 10.8°C, with about 86.9 mm of rain over roughly 16.8 rainy days.
- What is the air quality in Boulder in June?
- Boulder has a mean US Air Quality Index of about 44 in June.