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Boulder

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Boulder Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Boulder year round climate

  • Spring (March–May): 4.5–14.3°C on average, the climate gradually transitions from cold to warm, with rainfall gradually increasing, with the most rainfall in May. Common activities: Hiking, cycling, outdoor adventures. Suggested clothing: Light jacket, long-sleeved shirt, comfortable shoes.
  • Summer (June–August): 20.6–23.8°C on average, warm and dry climate, abundant sunshine. Common activities: Mountain climbing, camping, water activities. Suggested clothing: Short-sleeved shirts, shorts, sun protection clothing, hat.
  • Autumn (September–November): 12.4–19.7°C on average, pleasantly cool climate, dry weather, colorful scenery. Common activities: Maple leaf viewing, hiking, hot air ballooning. Suggested clothing: Light jacket, long-sleeved shirt, comfortable shoes.
  • Winter (December–February): -0.9–2.9°C on average, cold and dry climate, with possible snowfall. Common activities: Skiing, ice skating, snow viewing. Suggested clothing: Warm jacket, hat, gloves, scarf, waterproof and warm shoes.

Boulder climatological average

Annual average temperature: approx. 11°C / Annual rainfall: approx. 500 mm / Summer humidity: 30%–40% / Rainiest month: May

Boulder monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-0.9°C
26.3
February
1.4°C
37
March
4.5°C
44.7
April
9.9°C
47.3
May
14.3°C
79.5
June
20.6°C
61
July
23.8°C
33.5
August
22.9°C
51.5
September
19.7°C
29.8
October
12.4°C
18.8
November
4.1°C
37.9
December
2.9°C
32.8

Boulder weather for the next seven days

12/17
Wednesday
Sunny
17.4°C/5.5°C
12/18
Thursday
Sunny
7.3°C/-2.4°C
12/19
Friday
Sunny
13.4°C/3.7°C
12/20
Saturday
Sunny
10.3°C/0.3°C
12/21
Sunday
Patchy rain nearby
12.3°C/-0.5°C
12/22
Monday
Sunny
14.9°C/4.1°C
12/23
Tuesday
Sunny
12.5°C/4.7°C

Boulder Frequently Asked Questions and Useful Information for Travel

What is the best month to visit Boulder, Colorado?

The ideal time to visit Boulder is during late spring and early summer, specifically between May and June. This period offers perfect weather for outdoor activities like hiking and enjoying the local cafes, while avoiding the peak tourist crowds.

How many days do you need in Boulder?

Four days is generally sufficient to experience many of the best things Boulder has to offer. You can explore iconic destinations, enjoy top hikes, sample local restaurants, and visit Colorado craft breweries. For a first-time visit, planning for 4-5 days is recommended.

What are the top attractions in Boulder, Colorado?

Boulder boasts numerous attractions, including people-watching and boutique shopping on Pearl Street, getting a close look at the majestic Flatirons, touring the largest tea manufacturer in North America, and strolling through the picturesque University of Colorado campus.

Is Boulder worth a day trip?

Absolutely, Boulder is a fantastic addition to any Colorado vacation, even though it's sometimes overshadowed by Denver and Rocky Mountain National Park. A day trip is worthwhile to hike a trail, explore the shops and restaurants on Pearl Street, and visit the scenic Boulder Falls.

What can you do in Boulder besides hiking?

Beyond its renowned hiking trails, Boulder offers a vibrant cultural scene. You can explore the unique shops and diverse dining options along Pearl Street, visit local art galleries, enjoy craft breweries and distilleries, or simply soak in the laid-back atmosphere of this charming city.