S
M
T
W
T
F
S
29
66°
44°
30
67°
44°
1
66°
45°
2
67°
47°
3
69°
48°
4
71°
49°
5
72°
42°
6
66°
46°
7
69°
48°
8
72°
47°
9
73°
47°
10
72°
48°
11
72°
47°
12
71°
48°
13
72°
47°
14
73°
47°
15
72°
48°
16
72°
48°
17
71°
47°
18
72°
48°
19
73°
45°
20
73°
45°
21
67°
39°
22
64°
40°
23
63°
43°
24
66°
46°
25
67°
45°
26
66°
44°
27
65°
43°
28
65°
43°
29
66°
44°
30
66°
46°
31
66°
44°
1
67°
45°
2
68°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Monrovia
Monrovia's December 2026 forecast shows daily high temperatures ranging from 63° to 73°, with overnight lows between 39° and 49°. The average high for December is 69° with an average low of 45°. 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 Monrovia. See also: January | February | March.
