Best Time to Visit Boulder
Best time: Jun, Jul, Aug, Sep.
Jul is warmest (30.8°C high); May is rainiest (72 mm).
Boulder weather by month
| Month | High °C | Low °C | Rain mm | Sun hrs |
|---|---|---|---|---|
| Jan | 6.9 | -8.2 | 16 | 3.9 |
| Feb | 8.5 | -6.5 | 17 | 5.4 |
| Mar | 12 | -3.2 | 46 | 7.3 |
| Apr | 16.1 | 0.6 | 65 | 8.7 |
| May | 21.5 | 5.8 | 72 | 10.1 |
| Jun | 27.3 | 10.4 | 48 | 11.3 |
| Jul | 30.8 | 13.3 | 47 | 11.1 |
| Aug | 29.8 | 12.8 | 39 | 9.6 |
| Sep | 24.8 | 7.7 | 41 | 8.2 |
| Oct | 18.8 | 2 | 31 | 6 |
| Nov | 10.7 | -3.9 | 33 | 4.1 |
| Dec | 7.6 | -7.1 | 19 | 3.5 |
Average high temperature
Best months by activity
Overall: JunJulAugSep
Beaches: JulAugJunSep
Hiking: JunSepOctAug
Sightseeing: JunJulAugSep
Boulder quick facts
What to pack
Cold months (Jan, Feb, Mar, Nov, Dec): warm layers and a coat.
Frequently asked questions
When is the best time to visit Boulder?
Jun, Jul, Aug, Sep.
What is the rainiest month?
May, about 72 mm.
What is the warmest month?
Jul, with average highs of 30.8°C.
Where to stay
See Boulder hotels · Book Boulder tours & activities
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Climate data: Open-Meteo Historical (ERA5), 1991–2020 climate normals.
Licensed under CC BY 4.0.
Open-Meteo.