S
M
T
W
T
F
S
29
59°
45°
30
58°
40°
1
59°
44°
2
63°
48°
3
59°
46°
4
59°
45°
5
63°
44°
6
63°
43°
7
62°
45°
8
63°
46°
9
62°
44°
10
62°
44°
11
61°
46°
12
62°
46°
13
62°
47°
14
61°
46°
15
61°
41°
16
59°
42°
17
60°
41°
18
62°
41°
19
63°
45°
20
62°
44°
21
60°
42°
22
62°
45°
23
61°
41°
24
62°
47°
25
61°
45°
26
62°
37°
27
56°
42°
28
54°
45°
29
55°
44°
30
61°
45°
31
62°
46°
1
64°
42°
2
60°
38°
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 54° to 64°, with overnight lows between 37° and 48°. The average high for December is 61° with an average low of 44°. 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.
