S
M
T
W
T
F
S
26
72°
57°
27
71°
56°
28
69°
56°
29
65°
52°
30
66°
56°
31
65°
57°
1
69°
56°
2
67°
54°
3
69°
56°
4
66°
56°
5
69°
57°
6
70°
57°
7
70°
56°
8
69°
57°
9
70°
57°
10
70°
56°
11
69°
57°
12
71°
58°
13
70°
55°
14
68°
56°
15
69°
56°
16
66°
55°
17
69°
55°
18
67°
56°
19
68°
53°
20
68°
53°
21
67°
55°
22
68°
55°
23
68°
54°
24
67°
54°
25
68°
53°
26
64°
52°
27
63°
50°
28
63°
54°
29
62°
53°
30
62°
52°
31
63°
53°
1
62°
54°
2
64°
52°
3
63°
50°
4
61°
51°
5
61°
53°
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 61° to 72°, with overnight lows between 50° and 58°. The average high for August is 67° with an average low of 55°. 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.
