World Resorts USA Boulder

Boulder Monthly Weather Averages

Please click on any column to get detailed information about Boulder weather in that particular month. You will get daily weather information for that month for the last several years.

Day & Night air temperature, °F

jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0
12
24
36
48
60
72
84
96
37.0
42.6
56.0
68.7
73.1
74.0
68.2
55.7
44.0
37.0
30.0
29.5
24.4
27.6
38.8
50.1
55.9
56.1
50.7
39.1
28.7
23.1
17.0
17.3
Day temperature   
Night temperature

The warmest month in Boulder is july. The average daily temp is 74.0°F. The average nightly temp is 56.1°F.

Precipitation total, in.

jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0.0
0.4
0.8
1.3
1.7
2.1
2.5
2.9
3.4
0.4
0.7
0.5
0.7
1.6
2.2
2.5
2.4
1.6
1.5
0.6
0.3

January is the month with least precipitations during the year. The average precipitation totals for this month is 0.3 in. The month with most precipitation total is June.

Number of rainy days

jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0
1
2
3
4
5
6
7
1
1
1
1
2
5
6
4
3
2
1
0

This chart shows averages for the last three years. It shows medium and heavy rains only, it doesn't show light rains.

Wind speed, mph
jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0
1
2
3
4
5
6
7
8
9
10
8.7
8.2
7.2
6.6
6.3
6.4
7
6.7
8
7.2
8.8
8.6
Sunny, partly cloudy and cloudy days
1
2
3
4
5
6
7
8
9
10
11
12
0
5
10
15
20
25
30
35
5
4
2
3
2
3
4
8
9
8
6
7
9
7
8
7
15
16
12
14
9
11
9
9
17
19
21
21
13
12
13
9
13
12
13
15
Cloudy days   
Partly cloudy days   
Sunny days
Average sunny hours
jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0
1
2
3
4
5
6
7
8
9
10
11
6.5
7.1
8.5
9.5
9
9.5
9.6
8.1
7.9
7
6.8
6.1

Sunny hours are calculated based on the average daily number of hours while sunlight can reach the ground. It depends on day length and cloudiness during the day.

* Charts above show average data for the last 3 years.

Best time for vacation in Boulder

Sunniest months:
September 21 days
October 21 days
November 19 days
Warmest months:
July 74.0 °F
August 73.1 °F
September 68.7 °F
Coldest months:
January 29.5 °F
February 30.0 °F
March 37.0 °F
Rainiest months:
June 6 days
July 5 days
May 4 days
Windiest months:
February 8.8 mph
December 8.7 mph
January 8.6 mph

Boulder on a weather map

Leaflet | Tiles © Esri
Places in USA:
Name
°F
+23°F
+25°F
+75°F
+75°F
+52°F
+72°F
+63°F
+25°F
+46°F
+72°F
+63°F
+52°F
+50°F
+39°F
+23°F
24 Hours Forecast
Boulder
Local time: 19:50
January 09, thursday
2100
16°F
E
8 mph
January 10, friday
0000
12°F
E
9 mph
0300
9°F
E
11 mph
0600
9°F
E
11 mph
0900
12°F
E
12 mph
1200
30°F
E
6 mph
1500
36°F
E
9 mph
1800
32°F
E
12 mph
Units of measurement: °C / °F