S
M
T
W
T
F
S
29
52°
38°
30
55°
36°
1
55°
35°
2
50°
34°
3
54°
23°
4
58°
22°
5
43°
22°
6
42°
23°
7
45°
25°
8
46°
21°
9
44°
20°
10
41°
19°
11
39°
21°
12
40°
21°
13
42°
22°
14
42°
23°
15
44°
24°
16
46°
25°
17
46°
32°
18
48°
32°
19
49°
30°
20
43°
28°
21
42°
29°
22
41°
27°
23
42°
23°
24
45°
22°
25
41°
24°
26
38°
22°
27
39°
20°
28
40°
23°
29
39°
23°
30
41°
19°
31
45°
15°
1
Hist. Avg.
41°
21°
2
Hist. Avg.
41°
21°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Irvine
Irvine's December 2026 forecast shows daily high temperatures ranging from 38° to 58°, with overnight lows between 15° and 38°. The average high for December is 45° 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 Irvine. See also: January | February | March.
