S
M
T
W
T
F
S
30
88°
59°
31
86°
56°
1
90°
56°
2
90°
56°
3
88°
55°
4
89°
57°
5
90°
56°
6
86°
55°
7
86°
56°
8
85°
54°
9
80°
51°
10
81°
52°
11
81°
48°
12
83°
52°
13
86°
53°
14
85°
53°
15
84°
52°
16
84°
52°
17
85°
51°
18
84°
51°
19
83°
50°
20
83°
50°
21
82°
49°
22
83°
50°
23
83°
50°
24
82°
49°
25
82°
48°
26
81°
49°
27
80°
48°
28
80°
48°
29
79°
47°
30
78°
47°
1
78°
46°
2
76°
45°
3
77°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Windsor
Windsor's September 2026 forecast shows daily high temperatures ranging from 76° to 90°, with overnight lows between 45° and 59°. The average high for September is 83° with an average low of 51°. 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 Windsor. See also: October | November | December.
