S
M
T
W
T
F
S
26
74°
62°
27
72°
60°
28
74°
63°
29
78°
63°
30
77°
62°
31
77°
64°
1
79°
62°
2
77°
63°
3
76°
63°
4
77°
62°
5
72°
62°
6
77°
61°
7
78°
61°
8
71°
57°
9
70°
58°
10
72°
61°
11
71°
61°
12
74°
60°
13
76°
63°
14
78°
62°
15
78°
59°
16
70°
57°
17
70°
52°
18
72°
57°
19
77°
61°
20
73°
58°
21
77°
59°
22
76°
56°
23
74°
54°
24
71°
51°
25
72°
53°
26
73°
53°
27
75°
54°
28
76°
56°
29
76°
58°
30
75°
58°
31
76°
57°
1
76°
59°
2
75°
55°
3
75°
48°
4
67°
47°
5
66°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Penetanguishene
Penetanguishene's August 2026 forecast shows daily high temperatures ranging from 66° to 79°, with overnight lows between 47° and 64°. The average high for August is 74° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Penetanguishene. See also: September | October | November.
