S
M
T
W
T
F
S
30
85°
67°
31
91°
66°
1
93°
71°
2
94°
72°
3
96°
69°
4
97°
69°
5
88°
68°
6
81°
62°
7
84°
58°
8
85°
59°
9
86°
67°
10
89°
72°
11
87°
68°
12
85°
67°
13
87°
65°
14
87°
67°
15
86°
65°
16
82°
63°
17
81°
63°
18
83°
62°
19
78°
59°
20
80°
60°
21
84°
65°
22
83°
64°
23
77°
64°
24
78°
63°
25
79°
62°
26
82°
63°
27
82°
62°
28
81°
62°
29
81°
61°
30
80°
61°
1
81°
60°
2
80°
61°
3
80°
60°
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 77° to 89°, with overnight lows between 58° and 72°. The average high for September is 83° with an average low of 63°. 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.
