S
M
T
W
T
F
S
27
34°
-1°
28
23°
11°
29
26°
4°
30
28°
6°
31
25°
15°
1
34°
20°
2
35°
8°
3
36°
6°
4
28°
4°
5
26°
3°
6
25°
2°
7
25°
5°
8
24°
6°
9
29°
5°
10
32°
5°
11
31°
4°
12
27°
6°
13
30°
6°
14
32°
5°
15
32°
3°
16
29°
5°
17
29°
7°
18
30°
9°
19
34°
15°
20
35°
18°
21
36°
15°
22
34°
17°
23
35°
16°
24
37°
12°
25
37°
13°
26
35°
15°
27
33°
18°
28
37°
21°
29
39°
19°
30
Hist. Avg.
34°
15°
31
Hist. Avg.
34°
15°
1
Hist. Avg.
34°
15°
2
Hist. Avg.
34°
15°
3
Hist. Avg.
34°
16°
4
Hist. Avg.
35°
16°
5
Hist. Avg.
35°
16°
6
Hist. Avg.
35°
16°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
January Weather in Boulder
Boulder's January 2027 forecast shows daily high temperatures ranging from 23° to 39°, with overnight lows between -1° and 21°. The average high for January is 31° with an average low of 10°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how January weather will actually feel in Boulder. See also: February | March | April.
