S
M
T
W
T
F
S
26
84°
69°
27
87°
70°
28
88°
69°
29
87°
68°
30
86°
67°
31
79°
67°
1
83°
68°
2
87°
70°
3
89°
70°
4
88°
69°
5
89°
69°
6
87°
67°
7
84°
67°
8
84°
63°
9
83°
59°
10
79°
60°
11
80°
62°
12
79°
59°
13
79°
60°
14
80°
59°
15
78°
64°
16
79°
64°
17
85°
62°
18
79°
60°
19
79°
59°
20
82°
61°
21
82°
63°
22
82°
64°
23
85°
66°
24
85°
66°
25
86°
67°
26
87°
65°
27
86°
57°
28
83°
57°
29
78°
59°
30
77°
57°
31
78°
56°
1
77°
57°
2
76°
56°
3
76°
55°
4
77°
57°
5
79°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Markham
Markham's August 2026 forecast shows daily high temperatures ranging from 76° to 89°, with overnight lows between 55° and 70°. The average high for August is 82° with an average low of 63°. 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 Markham. See also: September | October | November.
