S
M
T
W
T
F
S
30
76°
60°
31
77°
65°
1
76°
67°
2
81°
59°
3
76°
56°
4
74°
57°
5
73°
56°
6
74°
60°
7
79°
61°
8
81°
65°
9
82°
64°
10
81°
57°
11
74°
63°
12
74°
60°
13
76°
55°
14
73°
55°
15
72°
54°
16
71°
53°
17
73°
61°
18
76°
51°
19
71°
55°
20
71°
52°
21
73°
54°
22
71°
59°
23
76°
61°
24
78°
60°
25
74°
60°
26
77°
59°
27
76°
60°
28
78°
57°
29
75°
58°
30
74°
59°
1
76°
56°
2
76°
49°
3
74°
46°
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 71° to 82°, with overnight lows between 46° and 67°. The average high for September is 75° 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.
