S
M
T
W
T
F
S
30
72°
64°
31
70°
61°
1
70°
54°
2
72°
54°
3
73°
63°
4
73°
59°
5
70°
50°
6
N/A
7
87°
64°
8
75°
55°
9
67°
48°
10
69°
51°
11
69°
54°
12
71°
57°
13
69°
55°
14
72°
57°
15
72°
57°
16
67°
53°
17
69°
54°
18
70°
52°
19
71°
53°
20
66°
54°
21
66°
55°
22
68°
55°
23
69°
54°
24
69°
55°
25
68°
51°
26
65°
47°
27
63°
47°
28
64°
46°
29
65°
46°
30
62°
53°
1
64°
49°
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 Grefrath
Grefrath's September 2026 forecast shows daily high temperatures ranging from 60° to 87°, with overnight lows between 46° and 64°. The average high for September is 68° 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 Grefrath. See also: October | November | December.
