S
M
T
W
T
F
S
29
63°
44°
30
64°
41°
1
66°
40°
2
62°
42°
3
61°
32°
4
66°
28°
5
62°
29°
6
49°
30°
7
50°
35°
8
59°
28°
9
61°
26°
10
48°
24°
11
46°
24°
12
45°
26°
13
45°
27°
14
47°
27°
15
49°
29°
16
50°
31°
17
50°
37°
18
53°
37°
19
60°
32°
20
58°
31°
21
49°
29°
22
48°
28°
23
48°
33°
24
50°
27°
25
57°
26°
26
47°
27°
27
47°
28°
28
46°
33°
29
49°
35°
30
51°
35°
31
Hist. Avg.
51°
30°
1
Hist. Avg.
51°
30°
2
Hist. Avg.
51°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Union
Union's December 2026 forecast shows daily high temperatures ranging from 45° to 66°, with overnight lows between 24° and 44°. The average high for December is 53° with an average low of 31°. 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 Union. See also: January | February | March.
