S
M
T
W
T
F
S
30
85°
63°
31
86°
62°
1
85°
63°
2
86°
63°
3
86°
62°
4
85°
62°
5
85°
61°
6
84°
63°
7
86°
61°
8
82°
60°
9
77°
60°
10
82°
59°
11
83°
60°
12
83°
59°
13
82°
58°
14
69°
50°
15
70°
56°
16
70°
55°
17
76°
52°
18
83°
56°
19
82°
46°
20
81°
43°
21
65°
45°
22
67°
46°
23
68°
53°
24
69°
52°
25
75°
53°
26
77°
54°
27
77°
54°
28
78°
53°
29
78°
46°
30
77°
39°
1
71°
37°
2
61°
42°
3
64°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Winterset
Winterset's September 2026 forecast shows daily high temperatures ranging from 61° to 86°, with overnight lows between 37° and 63°. The average high for September is 78° with an average low of 54°. 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 Winterset. See also: October | November | December.
