S
M
T
W
T
F
S
26
74°
63°
27
75°
62°
28
77°
64°
29
80°
64°
30
78°
63°
31
78°
65°
1
81°
65°
2
80°
64°
3
77°
64°
4
80°
63°
5
74°
62°
6
77°
64°
7
80°
62°
8
74°
58°
9
73°
58°
10
73°
60°
11
74°
63°
12
75°
63°
13
77°
64°
14
80°
63°
15
80°
61°
16
73°
59°
17
73°
52°
18
73°
55°
19
77°
63°
20
75°
60°
21
79°
61°
22
78°
58°
23
76°
55°
24
71°
53°
25
72°
57°
26
73°
53°
27
74°
54°
28
75°
54°
29
77°
59°
30
78°
60°
31
78°
60°
1
77°
61°
2
77°
57°
3
76°
50°
4
68°
48°
5
68°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Oshawa
Oshawa's August 2026 forecast shows daily high temperatures ranging from 68° to 81°, with overnight lows between 48° and 65°. The average high for August is 76° with an average low of 60°. 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 Oshawa. See also: September | October | November.
