Best Time to Visit Boulder, Colorado (2026)
The best time to visit Boulder is April through October, when average highs are 62-89°F with minimal rain. Avoid November when cold temperatures and heavy snow (7") make it the harshest month.
Month-by-Month Weather Overview
| Month | High | Low | Rain | Snow | Score |
|---|---|---|---|---|---|
| Jan | 45°F | 18°F | 0.6" | 7" | 5/10 |
| Feb | 47°F | 20°F | 0.5" | 6.5" | 5/10 |
| Mar | 55°F | 28°F | 1.4" | 9" | 6/10 |
| Apr | 62°F | 35°F | 2" | 6" | 8/10 |
| May | 72°F | 44°F | 2.5" | 1" | 10/10 |
| Jun | 83°F | 53°F | 1.6" | — | 10/10 |
| Jul | 89°F | 59°F | 1.8" | — | 10/10 |
| AugBest | 87°F | 57°F | 1.5" | — | 10/10 |
| Sep | 79°F | 48°F | 1.2" | — | 10/10 |
| Oct | 66°F | 37°F | 1" | 2.5" | 9/10 |
| Nov | 52°F | 25°F | 0.8" | 7" | 5/10 |
| Dec | 44°F | 17°F | 0.5" | 7.5" | 5/10 |
Tourism score: 1-10 (higher = better for visiting). Based on temperature comfort, rainfall, and humidity.
When NOT to Visit Boulder
November is the least ideal time to visit Boulder. Conditions are less favorable for tourism, with highs of 52°F and 0.8" of rain. The winter months from December through February bring the most challenging weather.
Seasonal Breakdown
Spring
Spring brings mild weather to Boulder, with highs around 63°F. Expect some rain (5.9" total) but increasingly pleasant days.
Summer
Boulder summers are warm with average highs of 86°F. Perfect for outdoor activities with longer daylight hours.
Fall
Fall brings comfortable temperatures to Boulder, with highs around 66°F. Often considered the best season to visit.
Winter
Winter in Boulder means snow (21" average) and cold, with highs around 45°F. Bundle up and enjoy winter activities.
What to Pack for August in Boulder
- ✓Sunscreen and hat
- ✓Light, breathable clothing
- ✓Refillable water bottle
- ✓UV-protection sunglasses
Safety in Boulder
While you're planning, Boulder has a Moderate safety rating based on FBI crime data. See full safety report.
Frequently Asked Questions
What is the best month to visit Boulder?
The best time to visit Boulder is April through October, when highs average 62-89°F with comfortable temperatures and manageable rainfall. August scores highest for tourism at 10/10.
What is the weather like in Boulder in August?
In August, Boulder has average highs of 87°F and lows of 57°F. Expect 1.5" of rainfall and 40% humidity. Snow is not expected.
Does it snow in Boulder?
Yes, Boulder gets an average of 46.5" of snow per year across 8 months. Winter gear is essential.
How hot does Boulder get?
The hottest month in Boulder is July, with average highs of 89°F and lows of 59°F. Humidity averages 40%. Summer heat can be intense.
What should I pack for Boulder?
For the best time to visit (August): Sunscreen and hat, Light, breathable clothing, Refillable water bottle, UV-protection sunglasses. If visiting in winter, add a heavy coat, warm hat, and insulated boots.