S
M
T
W
T
F
S
30
71°
56°
31
75°
59°
1
72°
58°
2
74°
55°
3
68°
52°
4
68°
52°
5
69°
53°
6
72°
57°
7
76°
56°
8
72°
52°
9
66°
49°
10
67°
55°
11
64°
42°
12
63°
49°
13
62°
47°
14
64°
48°
15
63°
44°
16
64°
45°
17
63°
45°
18
62°
44°
19
62°
41°
20
60°
40°
21
61°
41°
22
64°
50°
23
67°
47°
24
70°
51°
25
72°
51°
26
73°
50°
27
71°
45°
28
71°
50°
29
63°
43°
30
59°
48°
1
59°
50°
2
68°
39°
3
70°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Innisfil
Innisfil's September 2026 forecast shows daily high temperatures ranging from 59° to 76°, with overnight lows between 36° and 59°. The average high for September is 67° with an average low of 49°. 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 Innisfil. See also: October | November | December.
