S
M
T
W
T
F
S
30
75°
58°
31
76°
57°
1
76°
59°
2
75°
55°
3
75°
48°
4
67°
47°
5
66°
57°
6
69°
58°
7
75°
56°
8
73°
54°
9
69°
49°
10
70°
55°
11
73°
56°
12
73°
57°
13
74°
57°
14
74°
55°
15
73°
49°
16
68°
49°
17
67°
50°
18
69°
48°
19
64°
44°
20
62°
42°
21
59°
42°
22
61°
52°
23
63°
48°
24
63°
43°
25
60°
43°
26
61°
52°
27
67°
51°
28
68°
43°
29
67°
42°
30
59°
46°
1
60°
45°
2
65°
42°
3
56°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Penetanguishene
Penetanguishene's September 2026 forecast shows daily high temperatures ranging from 56° to 76°, with overnight lows between 40° and 59°. The average high for September is 68° with an average low of 50°. 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 Penetanguishene. See also: October | November | December.
