S
M
T
W
T
F
S
30
80°
63°
31
80°
66°
1
82°
66°
2
80°
58°
3
80°
56°
4
77°
56°
5
77°
57°
6
79°
56°
7
81°
58°
8
83°
64°
9
83°
63°
10
81°
55°
11
78°
57°
12
79°
61°
13
78°
54°
14
77°
54°
15
74°
52°
16
75°
53°
17
76°
56°
18
78°
57°
19
80°
60°
20
79°
58°
21
82°
59°
22
80°
60°
23
81°
60°
24
75°
59°
25
78°
58°
26
80°
58°
27
81°
57°
28
81°
57°
29
80°
56°
30
81°
57°
1
81°
57°
2
80°
49°
3
80°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Posen
Posen's September 2026 forecast shows daily high temperatures ranging from 74° to 83°, with overnight lows between 47° and 66°. The average high for September is 79° with an average low of 58°. 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 Posen. See also: October | November | December.
