S
M
T
W
T
F
S
29
54°
32°
30
52°
28°
1
54°
31°
2
53°
28°
3
54°
27°
4
51°
28°
5
52°
30°
6
58°
42°
7
62°
38°
8
64°
30°
9
63°
29°
10
53°
28°
11
55°
31°
12
56°
34°
13
54°
34°
14
49°
27°
15
50°
26°
16
49°
26°
17
50°
27°
18
50°
33°
19
51°
37°
20
50°
42°
21
61°
40°
22
63°
37°
23
61°
39°
24
63°
36°
25
63°
36°
26
61°
35°
27
60°
29°
28
58°
27°
29
50°
25°
30
48°
20°
31
49°
19°
1
43°
21°
2
47°
21°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Union
Union's December 2026 forecast shows daily high temperatures ranging from 43° to 64°, with overnight lows between 19° and 42°. The average high for December is 55° 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.
