S
M
T
W
T
F
S
26
81°
56°
27
81°
57°
28
73°
63°
29
74°
56°
30
78°
54°
31
85°
52°
1
84°
65°
2
67°
59°
3
74°
54°
4
81°
50°
5
85°
56°
6
79°
60°
7
79°
61°
8
84°
61°
9
80°
56°
10
79°
60°
11
77°
57°
12
75°
55°
13
78°
57°
14
80°
55°
15
78°
57°
16
79°
55°
17
73°
55°
18
79°
52°
19
72°
53°
20
74°
48°
21
77°
46°
22
75°
55°
23
66°
54°
24
66°
59°
25
71°
55°
26
78°
62°
27
71°
56°
28
68°
52°
29
70°
59°
30
73°
57°
31
68°
56°
1
70°
58°
2
66°
54°
3
69°
56°
4
70°
55°
5
68°
56°
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 78°, with overnight lows between 52° and 62°. The average high for August is 70° with an average low of 57°. 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.
