S
M
T
W
T
F
S
29
47°
23°
30
49°
23°
1
49°
19°
2
43°
20°
3
44°
16°
4
41°
28°
5
45°
28°
6
49°
26°
7
50°
24°
8
49°
25°
9
50°
26°
10
49°
24°
11
44°
21°
12
47°
18°
13
43°
22°
14
Hist. Avg.
43°
13°
15
Hist. Avg.
43°
13°
16
Hist. Avg.
43°
13°
17
Hist. Avg.
43°
13°
18
Hist. Avg.
43°
13°
19
Hist. Avg.
43°
13°
20
Hist. Avg.
43°
12°
21
Hist. Avg.
43°
12°
22
Hist. Avg.
43°
12°
23
Hist. Avg.
43°
12°
24
Hist. Avg.
43°
12°
25
Hist. Avg.
43°
12°
26
Hist. Avg.
43°
12°
27
Hist. Avg.
43°
12°
28
Hist. Avg.
43°
12°
29
Hist. Avg.
43°
12°
30
Hist. Avg.
43°
12°
31
Hist. Avg.
43°
12°
1
Hist. Avg.
43°
12°
2
Hist. Avg.
43°
12°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Fort Collins
Fort Collins's December 2026 forecast shows daily high temperatures ranging from 41° to 50°, with overnight lows between 16° and 28°. The average high for December is 47° with an average low of 23°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Fort Collins. See also: January | February | March.
