S
M
T
W
T
F
S
29
41°
27°
30
41°
28°
1
42°
30°
2
39°
24°
3
39°
22°
4
38°
25°
5
38°
30°
6
42°
36°
7
48°
33°
8
54°
29°
9
54°
27°
10
37°
24°
11
38°
26°
12
43°
26°
13
38°
27°
14
37°
25°
15
35°
23°
16
35°
22°
17
36°
20°
18
35°
27°
19
35°
31°
20
37°
35°
21
48°
28°
22
49°
27°
23
40°
33°
24
44°
32°
25
49°
31°
26
45°
30°
27
41°
22°
28
43°
20°
29
34°
21°
30
34°
13°
31
33°
14°
1
27°
15°
2
31°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Irwin
Irwin's December 2026 forecast shows daily high temperatures ranging from 27° to 54°, with overnight lows between 13° and 36°. The average high for December is 40° with an average low of 26°. 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 Irwin. See also: January | February | March.
