S
M
T
W
T
F
S
27
49°
9°
28
40°
11°
29
38°
8°
30
39°
4°
31
37°
8°
1
38°
8°
2
39°
9°
3
41°
9°
4
40°
7°
5
38°
6°
6
36°
7°
7
37°
19°
8
40°
10°
9
41°
10°
10
40°
13°
11
44°
10°
12
43°
11°
13
42°
13°
14
44°
19°
15
43°
9°
16
38°
6°
17
40°
15°
18
39°
7°
19
Hist. Avg.
45°
15°
20
Hist. Avg.
45°
15°
21
Hist. Avg.
44°
15°
22
Hist. Avg.
44°
15°
23
Hist. Avg.
44°
15°
24
Hist. Avg.
44°
15°
25
Hist. Avg.
44°
15°
26
Hist. Avg.
44°
15°
27
Hist. Avg.
44°
15°
28
Hist. Avg.
44°
15°
29
Hist. Avg.
44°
15°
30
Hist. Avg.
44°
15°
31
Hist. Avg.
44°
15°
1
Hist. Avg.
44°
15°
2
Hist. Avg.
44°
15°
3
Hist. Avg.
44°
15°
4
Hist. Avg.
45°
15°
5
Hist. Avg.
45°
15°
6
Hist. Avg.
45°
15°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
January Weather in Longmont
Longmont's January 2027 forecast shows daily high temperatures ranging from 36° to 49°, with overnight lows between 4° and 19°. The average high for January is 40° 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 Longmont. See also: February | March | April.
