S
M
T
W
T
F
S
26
85°
61°
27
84°
60°
28
85°
57°
29
86°
55°
30
85°
54°
31
79°
53°
1
80°
56°
2
85°
57°
3
86°
56°
4
85°
54°
5
83°
52°
6
80°
53°
7
82°
59°
8
86°
60°
9
87°
56°
10
87°
53°
11
85°
51°
12
80°
52°
13
81°
52°
14
82°
50°
15
80°
51°
16
81°
56°
17
85°
60°
18
84°
60°
19
85°
61°
20
86°
60°
21
77°
57°
22
76°
57°
23
76°
58°
24
80°
57°
25
76°
51°
26
73°
54°
27
74°
51°
28
74°
51°
29
75°
50°
30
75°
51°
31
76°
51°
1
75°
56°
2
74°
59°
3
74°
58°
4
72°
54°
5
73°
50°
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 72° to 87°, with overnight lows between 50° and 61°. The average high for August is 80° 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.
