S
M
T
W
T
F
S
29
72°
52°
30
66°
48°
1
67°
50°
2
66°
51°
3
66°
48°
4
67°
50°
5
67°
48°
6
70°
48°
7
72°
50°
8
68°
50°
9
64°
46°
10
62°
50°
11
64°
40°
12
63°
41°
13
65°
46°
14
70°
45°
15
72°
47°
16
71°
43°
17
65°
49°
18
67°
48°
19
67°
51°
20
69°
52°
21
71°
41°
22
69°
39°
23
63°
40°
24
63°
42°
25
64°
45°
26
66°
46°
27
65°
45°
28
64°
42°
29
64°
42°
30
65°
41°
31
63°
40°
1
63°
41°
2
64°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Irwindale
Irwindale's December 2026 forecast shows daily high temperatures ranging from 62° to 72°, with overnight lows between 39° and 52°. The average high for December is 66° with an average low of 46°. 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 Irwindale. See also: January | February | March.
