S
M
T
W
T
F
S
30
70°
57°
31
71°
58°
1
72°
58°
2
71°
57°
3
71°
56°
4
70°
53°
5
64°
51°
6
67°
50°
7
66°
52°
8
67°
54°
9
66°
52°
10
63°
50°
11
62°
50°
12
62°
49°
13
63°
53°
14
61°
49°
15
61°
51°
16
63°
47°
17
61°
47°
18
60°
46°
19
61°
50°
20
60°
46°
21
60°
46°
22
61°
47°
23
59°
48°
24
60°
47°
25
59°
46°
26
58°
45°
27
Hist. Avg.
61°
50°
28
Hist. Avg.
61°
50°
29
Hist. Avg.
61°
49°
30
Hist. Avg.
60°
49°
1
Hist. Avg.
60°
49°
2
Hist. Avg.
60°
49°
3
Hist. Avg.
60°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Altena
Altena's September 2026 forecast shows daily high temperatures ranging from 58° to 72°, with overnight lows between 45° and 58°. The average high for September is 64° with an average low of 51°. 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 Altena. See also: October | November | December.
