S
M
T
W
T
F
S
29
54°
38°
30
53°
33°
1
54°
35°
2
54°
33°
3
55°
33°
4
51°
34°
5
53°
37°
6
58°
48°
7
62°
41°
8
65°
34°
9
61°
33°
10
54°
34°
11
56°
39°
12
56°
41°
13
54°
37°
14
51°
32°
15
50°
32°
16
49°
33°
17
52°
34°
18
53°
43°
19
54°
44°
20
55°
47°
21
62°
47°
22
63°
46°
23
62°
43°
24
65°
40°
25
61°
42°
26
60°
42°
27
61°
32°
28
60°
34°
29
50°
30°
30
50°
26°
31
52°
25°
1
43°
28°
2
47°
26°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Forest Park
Forest Park's December 2026 forecast shows daily high temperatures ranging from 43° to 65°, with overnight lows between 25° and 48°. The average high for December is 55° with an average low of 36°. 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 Forest Park. See also: January | February | March.
