S
M
T
W
T
F
S
30
87°
46°
31
85°
52°
1
89°
51°
2
91°
47°
3
90°
46°
4
84°
45°
5
85°
45°
6
84°
44°
7
83°
42°
8
81°
44°
9
82°
46°
10
86°
50°
11
88°
50°
12
89°
48°
13
90°
46°
14
90°
43°
15
86°
42°
16
83°
44°
17
83°
45°
18
87°
46°
19
87°
48°
20
86°
47°
21
87°
46°
22
80°
44°
23
79°
40°
24
78°
39°
25
77°
39°
26
75°
41°
27
75°
42°
28
80°
41°
29
80°
39°
30
76°
39°
1
Hist. Avg.
86°
49°
2
Hist. Avg.
85°
48°
3
Hist. Avg.
85°
48°
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 75° to 91°, with overnight lows between 39° and 52°. The average high for September is 84° with an average low of 45°. 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.
