S
M
T
W
T
F
S
29
41°
28°
30
41°
28°
1
39°
26°
2
36°
26°
3
36°
27°
4
39°
27°
5
41°
25°
6
37°
23°
7
31°
23°
8
35°
18°
9
24°
16°
10
27°
18°
11
33°
21°
12
33°
21°
13
32°
20°
14
35°
20°
15
33°
21°
16
33°
20°
17
32°
19°
18
31°
18°
19
30°
17°
20
31°
17°
21
22°
14°
22
26°
1°
23
31°
-2°
24
21°
0°
25
16°
0°
26
17°
1°
27
18°
1°
28
22°
-3°
29
17°
13°
30
20°
-1°
31
32°
0°
1
15°
0°
2
17°
1°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Fallingbrook
Fallingbrook's December 2026 forecast shows daily high temperatures ranging from 15° to 41°, with overnight lows between -3° and 28°. The average high for December is 29° with an average low of 14°. 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 Fallingbrook. See also: January | February | March.
