S
M
T
W
T
F
S
30
80°
49°
31
79°
45°
1
80°
47°
2
81°
49°
3
81°
49°
4
80°
45°
5
78°
48°
6
79°
47°
7
75°
45°
8
73°
40°
9
73°
40°
10
74°
41°
11
75°
41°
12
77°
40°
13
78°
44°
14
79°
46°
15
78°
45°
16
75°
39°
17
74°
39°
18
73°
38°
19
71°
38°
20
76°
36°
21
75°
44°
22
75°
43°
23
72°
42°
24
67°
43°
25
66°
42°
26
67°
34°
27
66°
36°
28
67°
37°
29
66°
38°
30
66°
38°
1
Hist. Avg.
69°
37°
2
Hist. Avg.
69°
36°
3
Hist. Avg.
68°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Winona
Winona's September 2026 forecast shows daily high temperatures ranging from 66° to 81°, with overnight lows between 34° and 49°. The average high for September is 74° with an average low of 42°. 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 Winona. See also: October | November | December.
