S
M
T
W
T
F
S
29
44°
30°
30
47°
32°
1
46°
31°
2
44°
32°
3
47°
30°
4
45°
29°
5
45°
29°
6
42°
30°
7
45°
28°
8
41°
27°
9
37°
27°
10
37°
26°
11
39°
26°
12
38°
25°
13
39°
20°
14
40°
15°
15
34°
14°
16
29°
16°
17
31°
14°
18
30°
23°
19
34°
22°
20
38°
20°
21
36°
15°
22
34°
17°
23
32°
9°
24
32°
17°
25
30°
15°
26
34°
9°
27
29°
8°
28
25°
9°
29
28°
9°
30
26°
13°
31
29°
20°
1
39°
18°
2
39°
10°
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 25° to 47°, with overnight lows between 8° and 32°. The average high for December is 37° with an average low of 20°. 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.
