S
M
T
W
T
F
S
29
68°
48°
30
71°
59°
1
77°
58°
2
76°
51°
3
70°
50°
4
70°
58°
5
73°
54°
6
78°
57°
7
78°
52°
8
71°
49°
9
74°
56°
10
77°
57°
11
80°
46°
12
81°
45°
13
69°
52°
14
68°
48°
15
70°
45°
16
67°
53°
17
68°
55°
18
77°
56°
19
78°
55°
20
77°
55°
21
79°
57°
22
78°
57°
23
80°
46°
24
80°
43°
25
69°
43°
26
65°
48°
27
67°
55°
28
75°
56°
29
77°
57°
30
78°
58°
31
78°
57°
1
79°
54°
2
79°
53°
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 65° to 81°, with overnight lows between 43° and 59°. The average high for December is 74° with an average low of 53°. 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.
