S
M
T
W
T
F
S
30
89°
70°
31
94°
72°
1
97°
73°
2
99°
76°
3
99°
75°
4
93°
73°
5
87°
66°
6
82°
64°
7
83°
68°
8
84°
66°
9
87°
68°
10
85°
65°
11
85°
64°
12
79°
64°
13
80°
61°
14
85°
66°
15
82°
65°
16
78°
66°
17
79°
64°
18
79°
59°
19
76°
57°
20
76°
58°
21
78°
60°
22
80°
62°
23
82°
63°
24
83°
63°
25
81°
62°
26
80°
62°
27
79°
63°
28
79°
62°
29
81°
61°
30
78°
61°
1
74°
60°
2
74°
60°
3
77°
59°
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 74° to 99°, with overnight lows between 57° and 76°. The average high for September is 83° with an average low of 65°. 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.
