S
M
T
W
T
F
S
29
40°
31°
30
40°
31°
1
41°
36°
2
47°
38°
3
47°
35°
4
42°
32°
5
39°
31°
6
40°
32°
7
46°
39°
8
47°
40°
9
47°
39°
10
48°
35°
11
46°
34°
12
45°
36°
13
43°
36°
14
45°
35°
15
43°
36°
16
46°
36°
17
44°
35°
18
43°
36°
19
40°
35°
20
42°
37°
21
44°
36°
22
46°
36°
23
43°
34°
24
44°
36°
25
43°
37°
26
45°
35°
27
44°
34°
28
43°
36°
29
42°
36°
30
44°
37°
31
44°
36°
1
46°
35°
2
45°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Aachen
Aachen's December 2026 forecast shows daily high temperatures ranging from 39° to 48°, with overnight lows between 31° and 40°. The average high for December is 44° with an average low of 35°. 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 Aachen. See also: January | February | March.
