S
M
T
W
T
F
S
30
70°
56°
31
67°
53°
1
69°
52°
2
65°
53°
3
66°
55°
4
66°
50°
5
64°
50°
6
64°
49°
7
64°
49°
8
66°
50°
9
66°
49°
10
63°
50°
11
69°
51°
12
68°
49°
13
66°
54°
14
63°
53°
15
63°
49°
16
64°
45°
17
62°
47°
18
62°
46°
19
63°
45°
20
61°
47°
21
61°
52°
22
62°
52°
23
63°
49°
24
62°
47°
25
60°
45°
26
61°
44°
27
60°
50°
28
60°
45°
29
60°
44°
30
61°
45°
1
63°
50°
2
64°
48°
3
60°
45°
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 60° to 70°, with overnight lows between 44° and 56°. The average high for September is 64° with an average low of 49°. 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.
