Best Time To Visit Boulder - Time To Go To Boulder

Boulder experiences a dry climate that is characterized by mostly sunny weather. With the average temperature at 21.8 degree Celsius, July is the hottest month of the year and with a temperature of -1.1 degree Celsius, January is the coldest month of the year. 

  • Spring (March - May): Spring season in Boulder begins off as cold and slowly as the season progresses, there is a rise in the temperature level.
  • Summer (June - August): Summers in Boulder are warm and dry with little to no rainfall. The annual average low and high temperatures are 10.2 and 21.8 degree Celsius respectively. 
  • Autumn (September - November): As the season of Autumn starts, there is a drop in the mercury level and the season slowly moves on to the colder side.
  • Winter (December - February): The season of winter is mild and at times can be extremely cold. The average minimum and maximum temperatures are -8.5 and 0.8 degree Celsius respectively.

The peak season in Boulder is during the summer season when all the attractions in the city are open. Boulder is crowded by tourists during this time of the year and the expenses are on a higher side. The best time to visit Boulder is during the autumn season when the crowds and the cost of the stay are less. Winter is the offseason in Boulder.

Climate in Boulder

Know weather for your travel dates:

21-Sep-2018
Today 21 Sep

88

57

Clear throughout the day.

Wind:0.34 m/s

Humidity:25%

Precipitation:0.01%

  • Sat 22 Sep
    85 | 58

    Partly cloudy overnight.

  • Sun 23 Sep
    81 | 43

    Partly cloudy until evening.

  • Mon 24 Sep
    60 | 36

    Partly cloudy throughout the day.

  • Tue 25 Sep
    80 | 47

    Partly cloudy overnight.

  • Wed 26 Sep
    79 | 50

    Partly cloudy in the morning.

  • Thu 27 Sep
    87 | 55

    Overcast throughout the day.

Month wise Weather in Boulder

Average Temperature in Boulder by month

  • 80℉
  • 60℉
  • 40℉
  • 20℉ 0℉
Jan

Average temperature: 30℉

Minimum temperature: -8℉

Maximum temperature: 57℉

Feb

Average temperature: 40℉

Minimum temperature: 12℉

Maximum temperature: 72℉

Mar

Average temperature: 46℉

Minimum temperature: 21℉

Maximum temperature: 75℉

Apr

Average temperature: 47℉

Minimum temperature: 27℉

Maximum temperature: 73℉

May

Average temperature: 52℉

Minimum temperature: 32℉

Maximum temperature: 82℉

Jun

Average temperature: 64℉

Minimum temperature: 45℉

Maximum temperature: 90℉

Jul

Average temperature: 70℉

Minimum temperature: 48℉

Maximum temperature: 91℉

Aug

Average temperature: 65℉

Minimum temperature: 50℉

Maximum temperature: 86℉

Sep

Average temperature: 60℉

Minimum temperature: 39℉

Maximum temperature: 90℉

Oct

Average temperature: 49℉

Minimum temperature: 21℉

Maximum temperature: 79℉

Nov

Average temperature: 45℉

Minimum temperature: 27℉

Maximum temperature: 72℉

Dec

Average temperature: 29℉

Minimum temperature: -6℉

Maximum temperature: 57℉

Highest temperature in Boulder is recorded as 91.4℉ in July.

Lowest temperature in Boulder is recorded as -7.6℉ in January.

Average Rain in Boulder by Month (in mm)

  • 80
  • 60
  • 40
  • 20 0
Jan

Average Rain: 18.03 mm

Minimum Rain: 0 mm

Maximum Rain: 111.5 mm

Feb

Average Rain: 10.01 mm

Minimum Rain: 0 mm

Maximum Rain: 89.79 mm

Mar

Average Rain: 16.48 mm

Minimum Rain: 0 mm

Maximum Rain: 233.78 mm

Apr

Average Rain: 36.23 mm

Minimum Rain: 0 mm

Maximum Rain: 201.29 mm

May

Average Rain: 61.53 mm

Minimum Rain: 0 mm

Maximum Rain: 661.17 mm

Jun

Average Rain: 11.25 mm

Minimum Rain: 0 mm

Maximum Rain: 103.75 mm

Jul

Average Rain: 29.07 mm

Minimum Rain: 0 mm

Maximum Rain: 182.7 mm

Aug

Average Rain: 30.17 mm

Minimum Rain: 0 mm

Maximum Rain: 261.7 mm

Sep

Average Rain: 25.13 mm

Minimum Rain: 0 mm

Maximum Rain: 209.03 mm

Oct

Average Rain: 19.58 mm

Minimum Rain: 0 mm

Maximum Rain: 233.78 mm

Nov

Average Rain: 5.68 mm

Minimum Rain: 0 mm

Maximum Rain: 68.15 mm

Dec

Average Rain: 16.08 mm

Minimum Rain: 0 mm

Maximum Rain: 72.79 mm

Maximum rain recorded in Boulder is 661.17 mm in May.

Months with no rains or lowest rains in Boulder is November.

Average Humidity in Boulder by Month (in %)

  • 100
  • 75
  • 50
  • 25 0
Jan

Average Humidity: 62%

Minimum Humidity: 26%

Maximum Humidity: 87%

Feb

Average Humidity: 47%

Minimum Humidity: 19%

Maximum Humidity: 91%

Mar

Average Humidity: 43%

Minimum Humidity: 21%

Maximum Humidity: 88%

Apr

Average Humidity: 54%

Minimum Humidity: 25%

Maximum Humidity: 93%

May

Average Humidity: 59%

Minimum Humidity: 35%

Maximum Humidity: 96%

Jun

Average Humidity: 45%

Minimum Humidity: 27%

Maximum Humidity: 70%

Jul

Average Humidity: 48%

Minimum Humidity: 30%

Maximum Humidity: 73%

Aug

Average Humidity: 53%

Minimum Humidity: 34%

Maximum Humidity: 87%

Sep

Average Humidity: 51%

Minimum Humidity: 29%

Maximum Humidity: 91%

Oct

Average Humidity: 52%

Minimum Humidity: 24%

Maximum Humidity: 92%

Nov

Average Humidity: 55%

Minimum Humidity: 21%

Maximum Humidity: 90%

Dec

Average Humidity: 57%

Minimum Humidity: 34%

Maximum Humidity: 85%

Most humid month in Boulder is January.

Least humid month in Boulder is March.

Best time to visit Boulder Attractions in September

  • Best time to visit Flatirons in Boulder
    • Everyday : 07:00 AM to 10:00 AM
  • Best time to visit Chautauqua in Boulder
    • Everyday : 07:00 AM to 02:00 PM
  • Best time to visit Pearl Street in Boulder
    • Saturday, Sunday : Closed
    • Monday - Friday : 11:00 AM to 02:00 PM
  • Best time to visit Boulder Creek Path in Boulder
    • Everyday : 03:00 PM to 05:00 PM