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
N/A
14
71°
59°
15
81°
55°
16
63°
50°
17
64°
53°
18
63°
53°
19
66°
56°
20
66°
52°
21
65°
51°
22
67°
52°
23
65°
52°
24
67°
54°
25
69°
55°
26
63°
49°
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
*Temporarily Unavailable
September Weather in Aachen
Aachen's September 2026 forecast shows daily high temperatures ranging from 62° to 81°, with overnight lows between 49° and 59°. 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.
