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
65°
46°
19
62°
46°
20
65°
45°
21
57°
42°
22
62°
41°
23
65°
43°
24
65°
41°
25
67°
38°
26
71°
47°
27
71°
51°
28
66°
53°
29
71°
53°
30
70°
57°
1
68°
53°
2
67°
50°
3
65°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Orillia
Orillia's September 2026 forecast shows daily high temperatures ranging from 65° to 71°, with overnight lows between 47° and 57°. The average high for September is 69° with an average low of 52°. 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 Orillia. See also: October | November | December.
