S
M
T
W
T
F
S
27
43°
18°
28
36°
20°
29
33°
23°
30
40°
19°
31
36°
20°
1
39°
23°
2
42°
27°
3
43°
20°
4
38°
16°
5
36°
16°
6
34°
15°
7
34°
17°
8
35°
16°
9
34°
16°
10
37°
17°
11
40°
16°
12
37°
15°
13
34°
16°
14
35°
17°
15
37°
16°
16
38°
16°
17
36°
17°
18
35°
17°
19
38°
23°
20
41°
24°
21
38°
18°
22
38°
19°
23
39°
19°
24
41°
24°
25
41°
22°
26
43°
23°
27
43°
25°
28
45°
27°
29
44°
27°
30
42°
26°
31
Hist. Avg.
35°
4°
1
Hist. Avg.
35°
4°
2
Hist. Avg.
35°
4°
3
Hist. Avg.
35°
4°
4
Hist. Avg.
35°
4°
5
Hist. Avg.
35°
4°
6
Hist. Avg.
35°
4°
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 33° to 45°, with overnight lows between 15° and 27°. The average high for January is 38° with an average low of 20°. 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.
