S
M
T
W
T
F
S
29
47°
26°
30
46°
30°
1
50°
34°
2
51°
30°
3
49°
35°
4
53°
37°
5
53°
39°
6
54°
31°
7
54°
23°
8
43°
32°
9
45°
33°
10
44°
33°
11
48°
32°
12
44°
33°
13
44°
35°
14
50°
31°
15
50°
25°
16
43°
28°
17
45°
22°
18
42°
26°
19
41°
30°
20
43°
32°
21
44°
31°
22
47°
27°
23
47°
24°
24
38°
23°
25
39°
27°
26
46°
32°
27
47°
27°
28
46°
24°
29
39°
23°
30
35°
18°
31
37°
14°
1
36°
13°
2
31°
15°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Mission
Mission's December 2026 forecast shows daily high temperatures ranging from 31° to 54°, with overnight lows between 13° and 39°. The average high for December is 45° with an average low of 28°. 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 Mission. See also: January | February | March.
