S
M
T
W
T
F
S
29
35°
28°
30
35°
30°
1
36°
26°
2
32°
22°
3
31°
22°
4
35°
26°
5
34°
26°
6
34°
15°
7
29°
25°
8
31°
19°
9
27°
20°
10
30°
21°
11
34°
26°
12
35°
25°
13
38°
25°
14
39°
21°
15
38°
24°
16
39°
23°
17
33°
13°
18
25°
12°
19
28°
13°
20
29°
14°
21
26°
18°
22
29°
15°
23
31°
26°
24
38°
26°
25
32°
19°
26
32°
12°
27
31°
15°
28
29°
13°
29
27°
12°
30
26°
21°
31
27°
25°
1
31°
22°
2
35°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Missoula
Missoula's December 2026 forecast shows daily high temperatures ranging from 25° to 39°, with overnight lows between 12° and 30°. The average high for December is 32° with an average low of 21°. 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 Missoula. See also: January | February | March.
