+40.0150° · -105.2706° · ELEV 0m
Boulder
United States · Colorado
Monthly weather averages for Boulder, United States — temperature highs and lows, rainfall, sunshine hours by month, and the best time to visit.
№ 01
July → FebruaryClimate Overview
Boulder has a continental climate. The warmest month is July (29°C average high) and the coolest is January (4°C).
№ 02
552 mm / yearRainfall by Month
Boulder sees 552 mm of rain a year. The wettest month is May (124 mm); the driest is December (25 mm).
№ 03
June–SeptemberBest Time to Visit
June–September
11°C – 29°C · 12.4h sun
The best time to visit Boulder is June–September, when temperatures average 11°C–29°C with 12.4 sunshine hours per day.
Some visitors prefer May for cooler, drier conditions.
№ 04
12 months · °C · mm · hoursMonthly Breakdown
| January | 3.5°C | -8.4°C | 29 mm | 8.0 h | 07:20 | 16:59 |
|---|---|---|---|---|---|---|
| February | 3.8°C | -9.4°C | 33 mm | 9.2 h | 06:54 | 17:36 |
| March | 9.3°C | -4.7°C | 50 mm | 10.1 h | 07:12 | 19:07 |
| April | 14.0°C | -0.5°C | 55 mm | 11.0 h | 06:23 | 19:38 |
| May | 18.2°C | 5.0°C | 124 mm | 11.7 h | 05:45 | 20:09 |
| June | 26.1°C | 11.8°C | 53 mm | 13.0 h | 05:31 | 20:31 |
| July | 29.4°C | 15.1°C | 50 mm | 13.0 h | 05:44 | 20:29 |
| August | 28.2°C | 14.2°C | 39 mm | 12.5 h | 06:12 | 19:58 |
| September | 25.4°C | 10.8°C | 29 mm | 11.2 h | 06:42 | 19:10 |
| October | 16.9°C | 3.1°C | 37 mm | 9.7 h | 07:11 | 18:22 |
| November | 9.8°C | -3.2°C | 28 mm | 8.6 h | 06:46 | 16:45 |
| December | 5.0°C | -6.9°C | 25 mm | 7.7 h | 07:15 | 16:36 |