S
M
T
W
T
F
S
30
72°
63°
31
68°
61°
1
71°
57°
2
71°
55°
3
72°
62°
4
74°
62°
5
N/A
6
73°
60°
7
85°
64°
8
66°
55°
9
65°
52°
10
66°
54°
11
64°
54°
12
64°
52°
13
65°
53°
14
66°
54°
15
67°
54°
16
67°
54°
17
68°
52°
18
67°
49°
19
64°
52°
20
66°
55°
21
66°
55°
22
68°
56°
23
69°
55°
24
69°
55°
25
68°
52°
26
65°
48°
27
63°
47°
28
64°
47°
29
65°
48°
30
62°
53°
1
64°
50°
2
60°
48°
3
65°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Mettmann
Mettmann's September 2026 forecast shows daily high temperatures ranging from 60° to 85°, with overnight lows between 47° and 64°. 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 Mettmann. See also: October | November | December.
