S
M
T
W
T
F
S
30
69°
55°
31
70°
51°
1
68°
51°
2
68°
52°
3
69°
51°
4
67°
51°
5
67°
50°
6
68°
49°
7
66°
47°
8
66°
45°
9
67°
48°
10
66°
52°
11
68°
51°
12
64°
50°
13
65°
49°
14
64°
52°
15
69°
47°
16
67°
45°
17
64°
47°
18
67°
53°
19
69°
53°
20
70°
52°
21
69°
53°
22
69°
52°
23
67°
53°
24
68°
52°
25
66°
48°
26
63°
47°
27
63°
46°
28
62°
47°
29
64°
49°
30
59°
46°
1
58°
49°
2
58°
49°
3
Hist. Avg.
61°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grünau
Grünau's September 2026 forecast shows daily high temperatures ranging from 58° to 70°, with overnight lows between 45° and 55°. The average high for September is 66° 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 Grünau. See also: October | November | December.
