S
M
T
W
T
F
S
30
71°
54°
31
72°
57°
1
72°
57°
2
71°
56°
3
69°
53°
4
64°
53°
5
65°
50°
6
64°
51°
7
68°
49°
8
68°
51°
9
70°
50°
10
68°
50°
11
68°
52°
12
67°
54°
13
63°
53°
14
64°
53°
15
62°
54°
16
65°
53°
17
66°
51°
18
67°
48°
19
66°
51°
20
63°
49°
21
64°
45°
22
63°
44°
23
60°
45°
24
61°
44°
25
61°
45°
26
65°
46°
27
64°
49°
28
62°
48°
29
60°
46°
30
62°
50°
1
57°
49°
2
62°
43°
3
59°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Siegen
Siegen's September 2026 forecast shows daily high temperatures ranging from 57° to 72°, with overnight lows between 43° and 57°. The average high for September is 65° with an average low of 50°. 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 Siegen. See also: October | November | December.
