Boulder Weather Year-Round — Best Time to Visit
Boulder, United States has mild weather year-round. The best time to visit is August (score: 86/100). Annual average high: 15.9°C, total rainfall: 586mm.
When is the best time to visit Boulder?
86
August is the best month to visit Boulder with a travel score of 86/100 (Excellent).
Expect highs of 28.1°C, 11 rain days, and 12.5 hours of daily sunshine.
View August weather details →Travel Score by Month
58
Jan
59
Feb
65
Mar
69
Apr
72
May
84
Jun
86
Jul
86
Aug
85
Sep
77
Oct
66
Nov
58
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Boulder each month?
15.9°C
Avg High
1.8°C
Avg Low
586mm
Annual Rain
How much rain does Boulder get?
Boulder receives 586mm of rain annually. The wettest month is typically May with 97mm, while December is the driest.
What is the weather like each month in Boulder?
January
58
4°C
Low: -9°C
5 rain days
Mixed
February
59
5°C
Low: -9°C
7 rain days
Mixed
March
65
10°C
Low: -5°C
8 rain days
Good
April
69
14°C
Low: 0°C
10 rain days
Good
May
72
19°C
Low: 5°C
13 rain days
Good
June
84
26°C
Low: 11°C
11 rain days
Excellent
July
86
29°C
Low: 15°C
12 rain days
Excellent
August
Best time to visit86
28°C
Low: 14°C
11 rain days
Excellent
September
85
24°C
Low: 10°C
8 rain days
Excellent
October
77
17°C
Low: 3°C
6 rain days
Good
November
66
10°C
Low: -4°C
6 rain days
Good
December
58
5°C
Low: -8°C
5 rain days
Mixed
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Data based on 1994–2024 averages · Last updated: 2024-12-31