S
M
T
W
T
F
S
29
63°
43°
30
62°
41°
1
61°
32°
2
47°
28°
3
48°
30°
4
54°
39°
5
55°
34°
6
47°
29°
7
47°
28°
8
46°
26°
9
45°
26°
10
45°
27°
11
49°
28°
12
52°
32°
13
54°
33°
14
49°
30°
15
48°
32°
16
45°
34°
17
48°
30°
18
46°
26°
19
45°
24°
20
44°
25°
21
45°
26°
22
50°
28°
23
45°
26°
24
43°
24°
25
43°
23°
26
44°
25°
27
44°
24°
28
45°
25°
29
44°
27°
30
44°
27°
31
46°
24°
1
44°
23°
2
43°
25°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Grannis
Grannis's December 2026 forecast shows daily high temperatures ranging from 43° to 63°, with overnight lows between 23° and 43°. The average high for December is 48° with an average low of 29°. 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 Grannis. See also: January | February | March.
