S
M
T
W
T
F
S
29
73°
53°
30
74°
52°
1
73°
52°
2
69°
51°
3
72°
48°
4
66°
46°
5
65°
48°
6
67°
48°
7
67°
49°
8
66°
46°
9
64°
51°
10
65°
46°
11
64°
42°
12
63°
42°
13
62°
43°
14
64°
44°
15
65°
45°
16
64°
44°
17
64°
44°
18
65°
45°
19
65°
46°
20
66°
46°
21
68°
49°
22
68°
52°
23
66°
44°
24
69°
43°
25
64°
44°
26
64°
44°
27
65°
46°
28
66°
46°
29
68°
47°
30
68°
47°
31
69°
48°
1
69°
46°
2
68°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Tustin
Tustin's December 2026 forecast shows daily high temperatures ranging from 62° to 74°, with overnight lows between 42° and 53°. The average high for December is 67° with an average low of 47°. 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 Tustin. See also: January | February | March.
