S
M
T
W
T
F
S
30
75°
68°
31
84°
69°
1
90°
71°
2
95°
70°
3
84°
68°
4
77°
67°
5
79°
62°
6
77°
60°
7
78°
59°
8
81°
57°
9
79°
68°
10
82°
57°
11
75°
55°
12
81°
59°
13
81°
57°
14
69°
53°
15
80°
57°
16
72°
64°
17
71°
63°
18
73°
58°
19
67°
61°
20
70°
54°
21
67°
51°
22
65°
52°
23
65°
54°
24
66°
56°
25
70°
54°
26
71°
56°
27
70°
53°
28
70°
57°
29
71°
54°
30
69°
55°
1
70°
50°
2
65°
55°
3
63°
56°
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 63° to 73°, with overnight lows between 50° and 61°. The average high for September is 68° with an average low of 55°. 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.
