S
M
T
W
T
F
S
30
72°
48°
31
74°
52°
1
72°
50°
2
67°
48°
3
67°
49°
4
68°
48°
5
65°
47°
6
66°
46°
7
67°
46°
8
72°
47°
9
72°
47°
10
72°
48°
11
71°
50°
12
66°
47°
13
68°
49°
14
65°
50°
15
65°
52°
16
68°
53°
17
71°
52°
18
66°
49°
19
70°
45°
20
68°
44°
21
63°
43°
22
63°
43°
23
62°
42°
24
62°
44°
25
63°
46°
26
61°
44°
27
62°
43°
28
62°
48°
29
63°
50°
30
65°
47°
1
65°
43°
2
61°
42°
3
60°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grenzach-Wyhlen
Grenzach-Wyhlen's September 2026 forecast shows daily high temperatures ranging from 60° to 74°, with overnight lows between 41° and 53°. The average high for September is 66° with an average low of 47°. 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 Grenzach-Wyhlen. See also: October | November | December.
