S
M
T
W
T
F
S
29
36°
27°
30
36°
29°
1
37°
33°
2
38°
36°
3
40°
35°
4
42°
35°
5
41°
34°
6
45°
35°
7
42°
35°
8
41°
34°
9
38°
33°
10
36°
32°
11
44°
27°
12
40°
27°
13
36°
19°
14
35°
18°
15
31°
21°
16
33°
22°
17
30°
28°
18
36°
30°
19
36°
26°
20
37°
30°
21
37°
29°
22
36°
31°
23
42°
29°
24
44°
24°
25
41°
19°
26
35°
19°
27
30°
24°
28
34°
28°
29
40°
28°
30
40°
31°
31
42°
32°
1
43°
24°
2
45°
18°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Berwyn
Berwyn's December 2026 forecast shows daily high temperatures ranging from 30° to 45°, with overnight lows between 18° and 36°. The average high for December is 38° with an average low of 28°. 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 Berwyn. See also: January | February | March.
