S
M
T
W
T
F
S
30
73°
64°
31
70°
61°
1
72°
57°
2
72°
57°
3
73°
64°
4
75°
63°
5
70°
52°
6
77°
50°
7
88°
59°
8
77°
57°
9
64°
55°
10
68°
52°
11
68°
54°
12
70°
52°
13
68°
61°
14
72°
60°
15
82°
56°
16
64°
50°
17
63°
53°
18
64°
54°
19
67°
58°
20
67°
53°
21
65°
51°
22
67°
52°
23
66°
50°
24
65°
52°
25
66°
53°
26
67°
51°
27
65°
52°
28
65°
53°
29
64°
52°
30
64°
52°
1
62°
51°
2
63°
51°
3
64°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Aachen
Aachen's September 2026 forecast shows daily high temperatures ranging from 62° to 82°, with overnight lows between 50° and 60°. The average high for September is 66° with an average low of 53°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Aachen. See also: October | November | December.
