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