S
M
T
W
T
F
S
29
57°
28°
30
56°
28°
1
55°
28°
2
57°
31°
3
57°
29°
4
55°
29°
5
56°
28°
6
56°
31°
7
59°
31°
8
57°
32°
9
57°
31°
10
60°
34°
11
61°
35°
12
60°
34°
13
61°
33°
14
60°
32°
15
60°
29°
16
61°
29°
17
56°
28°
18
57°
30°
19
59°
29°
20
61°
29°
21
58°
28°
22
60°
29°
23
58°
31°
24
61°
33°
25
62°
35°
26
62°
26°
27
56°
28°
28
55°
34°
29
60°
34°
30
63°
33°
31
65°
32°
1
64°
36°
2
63°
25°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Mountain Mesa
Mountain Mesa's December 2026 forecast shows daily high temperatures ranging from 55° to 65°, with overnight lows between 25° and 36°. The average high for December is 59° with an average low of 31°. 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 Mountain Mesa. See also: January | February | March.
