S
M
T
W
T
F
S
29
39°
26°
30
38°
26°
1
37°
20°
2
38°
19°
3
35°
21°
4
33°
29°
5
38°
31°
6
43°
35°
7
47°
28°
8
48°
26°
9
42°
20°
10
34°
21°
11
35°
22°
12
34°
20°
13
34°
23°
14
32°
25°
15
34°
23°
16
35°
27°
17
35°
27°
18
37°
26°
19
37°
29°
20
44°
25°
21
46°
21°
22
38°
22°
23
36°
26°
24
40°
25°
25
40°
24°
26
37°
15°
27
34°
13°
28
31°
12°
29
26°
6°
30
28°
5°
31
26°
8°
1
21°
12°
2
26°
13°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Westmont
Westmont's December 2026 forecast shows daily high temperatures ranging from 21° to 48°, with overnight lows between 5° and 35°. The average high for December is 36° with an average low of 21°. 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 Westmont. See also: January | February | March.
