S
M
T
W
T
F
S
30
97°
65°
31
98°
72°
1
100°
76°
2
100°
77°
3
100°
81°
4
101°
75°
5
103°
77°
6
104°
76°
7
99°
74°
8
102°
68°
9
99°
76°
10
100°
74°
11
90°
71°
12
95°
70°
13
97°
71°
14
98°
72°
15
100°
73°
16
98°
72°
17
97°
69°
18
90°
62°
19
85°
61°
20
80°
60°
21
82°
60°
22
83°
60°
23
85°
62°
24
81°
58°
25
86°
64°
26
86°
65°
27
85°
63°
28
85°
63°
29
84°
62°
30
82°
63°
1
83°
61°
2
82°
61°
3
83°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Posey
Posey's September 2026 forecast shows daily high temperatures ranging from 80° to 100°, with overnight lows between 58° and 73°. The average high for September is 88° 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 Posey. See also: October | November | December.
