Best Time to Visit Boulder: Month-by-Month Guide
Best months for Boulder: September, June.
- Best months for Boulder: September, June.
- Peak season is July, August, June. Expect higher prices and more visitors (estimated from the climate, not from visitor counts).
- Shoulder season: September. Good weather without the busiest period.
- Wettest months: May, July, August.
- The least pleasant month is December (score 4.7).
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 4°C | -9°C | 23 mm | 6 | – | – | 4.7 |
| February | 5°C | -9°C | 26 mm | 7 | – | – | 4.7 |
| March | 10°C | -5°C | 50 mm | 9 | – | – | 5.5 |
| April | 13°C | -1°C | 77 mm | 11 | – | – | 5.9 |
| May | 18°C | 3°C | 103 mm | 16 | – | – | 6.2 |
| June | 24°C | 8°C | 77 mm | 14 | – | – | 7.2 |
| July | 27°C | 12°C | 75 mm | 15 | – | – | 7.1 |
| August | 26°C | 11°C | 71 mm | 15 | – | – | 7.1 |
| September | 22°C | 7°C | 54 mm | 10 | – | – | 7.8 |
| October | 16°C | 1°C | 47 mm | 8 | – | – | 6.9 |
| November | 8°C | -5°C | 33 mm | 6 | – | – | 5.6 |
| December | 3°C | -9°C | 23 mm | 5 | – | – | 4.7 |
Frequently asked questions
When is the best time to visit Boulder?
The best months are September, June.
When is the rainy season in Boulder?
The wettest months are May, July, August.