S
M
T
W
T
F
S
26
77°
65°
27
81°
65°
28
79°
64°
29
81°
64°
30
78°
61°
31
73°
60°
1
74°
63°
2
77°
65°
3
81°
66°
4
82°
65°
5
79°
65°
6
77°
63°
7
79°
63°
8
81°
64°
9
80°
57°
10
74°
56°
11
72°
57°
12
73°
58°
13
73°
55°
14
74°
57°
15
74°
62°
16
73°
63°
17
77°
60°
18
73°
56°
19
74°
58°
20
77°
61°
21
79°
63°
22
78°
63°
23
77°
62°
24
78°
57°
25
76°
54°
26
71°
56°
27
71°
62°
28
73°
60°
29
75°
59°
30
76°
61°
31
74°
54°
1
73°
56°
2
71°
52°
3
69°
51°
4
70°
52°
5
73°
58°
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 69° to 82°, with overnight lows between 51° and 66°. 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.
