S
M
T
W
T
F
S
29
51°
37°
30
52°
37°
1
50°
31°
2
40°
29°
3
40°
29°
4
47°
32°
5
48°
34°
6
39°
27°
7
35°
22°
8
34°
20°
9
34°
23°
10
38°
27°
11
41°
27°
12
42°
26°
13
41°
25°
14
35°
21°
15
36°
24°
16
36°
27°
17
39°
25°
18
37°
20°
19
35°
18°
20
33°
16°
21
30°
17°
22
31°
23°
23
37°
24°
24
35°
23°
25
33°
15°
26
32°
14°
27
31°
15°
28
31°
15°
29
30°
18°
30
30°
18°
31
31°
14°
1
31°
10°
2
29°
9°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Fillmore
Fillmore's December 2026 forecast shows daily high temperatures ranging from 29° to 52°, with overnight lows between 9° and 37°. The average high for December is 37° with an average low of 23°. 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 Fillmore. See also: January | February | March.
