S
M
T
W
T
F
S
29
42°
27°
30
43°
25°
1
40°
28°
2
42°
22°
3
39°
22°
4
37°
26°
5
40°
32°
6
44°
38°
7
50°
30°
8
54°
28°
9
50°
26°
10
37°
25°
11
40°
24°
12
42°
26°
13
39°
26°
14
37°
23°
15
34°
20°
16
34°
23°
17
35°
24°
18
35°
28°
19
36°
31°
20
43°
31°
21
49°
24°
22
49°
26°
23
37°
32°
24
47°
29°
25
49°
29°
26
44°
28°
27
40°
19°
28
42°
18°
29
31°
13°
30
33°
10°
31
32°
12°
1
26°
13°
2
30°
16°
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 26° to 54°, with overnight lows between 10° and 38°. The average high for December is 40° with an average low of 24°. 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.
