S
M
T
W
T
F
S
30
75°
62°
31
67°
64°
1
75°
66°
2
78°
61°
3
76°
56°
4
74°
56°
5
74°
55°
6
73°
54°
7
75°
48°
8
75°
51°
9
73°
63°
10
71°
48°
11
70°
46°
12
78°
46°
13
73°
51°
14
64°
43°
15
68°
43°
16
71°
51°
17
71°
49°
18
70°
45°
19
62°
48°
20
66°
43°
21
60°
41°
22
61°
45°
23
59°
47°
24
60°
46°
25
65°
47°
26
67°
48°
27
67°
46°
28
65°
50°
29
68°
51°
30
67°
50°
1
65°
44°
2
60°
46°
3
59°
49°
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 70°, with overnight lows between 41° and 51°. The average high for September is 64° with an average low of 47°. 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.
