S
M
T
W
T
F
S
30
81°
69°
31
91°
72°
1
94°
74°
2
95°
74°
3
91°
72°
4
90°
71°
5
87°
69°
6
82°
67°
7
78°
64°
8
76°
65°
9
78°
64°
10
79°
63°
11
76°
60°
12
77°
59°
13
76°
62°
14
77°
59°
15
80°
64°
16
80°
64°
17
79°
63°
18
79°
64°
19
80°
64°
20
80°
63°
21
79°
64°
22
80°
63°
23
80°
63°
24
79°
62°
25
80°
63°
26
78°
62°
27
79°
61°
28
78°
61°
29
77°
60°
30
76°
60°
1
76°
59°
2
75°
59°
3
76°
58°
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 75° to 95°, with overnight lows between 58° and 74°. The average high for September is 80° with an average low of 64°. 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.
