S
M
T
W
T
F
S
27
48°
25°
28
50°
22°
29
46°
24°
30
49°
26°
31
48°
18°
1
43°
13°
2
41°
15°
3
40°
14°
4
42°
16°
5
44°
17°
6
43°
16°
7
42°
23°
8
43°
17°
9
43°
15°
10
40°
17°
11
41°
20°
12
47°
14°
13
42°
14°
14
41°
15°
15
42°
24°
16
47°
24°
17
49°
20°
18
45°
27°
19
47°
29°
20
50°
25°
21
46°
22°
22
44°
22°
23
43°
20°
24
46°
21°
25
47°
22°
26
49°
25°
27
48°
21°
28
47°
25°
29
55°
26°
30
Hist. Avg.
47°
21°
31
Hist. Avg.
47°
21°
1
Hist. Avg.
47°
21°
2
Hist. Avg.
47°
21°
3
Hist. Avg.
47°
21°
4
Hist. Avg.
47°
21°
5
Hist. Avg.
47°
21°
6
Hist. Avg.
47°
21°
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 40° to 55°, with overnight lows between 13° and 29°. The average high for January is 45° 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.
