S
M
T
W
T
F
S
29
61°
40°
30
62°
33°
1
47°
28°
2
46°
28°
3
53°
39°
4
56°
38°
5
50°
34°
6
49°
31°
7
46°
26°
8
43°
25°
9
45°
27°
10
47°
33°
11
51°
32°
12
57°
35°
13
51°
34°
14
47°
26°
15
47°
27°
16
46°
29°
17
45°
21°
18
42°
20°
19
43°
18°
20
39°
22°
21
45°
28°
22
48°
24°
23
42°
23°
24
43°
21°
25
42°
26°
26
47°
32°
27
48°
27°
28
45°
23°
29
42°
24°
30
42°
22°
31
44°
18°
1
40°
21°
2
42°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Mountain View
Mountain View's December 2026 forecast shows daily high temperatures ranging from 39° to 62°, with overnight lows between 18° and 40°. The average high for December is 47° 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 Mountain View. See also: January | February | March.
