S
M
T
W
T
F
S
26
82°
62°
27
84°
63°
28
80°
68°
29
80°
65°
30
84°
63°
31
87°
60°
1
84°
71°
2
71°
62°
3
81°
62°
4
82°
55°
5
85°
62°
6
84°
65°
7
80°
69°
8
86°
65°
9
82°
60°
10
85°
69°
11
84°
65°
12
82°
63°
13
83°
62°
14
81°
60°
15
76°
67°
16
80°
66°
17
80°
64°
18
81°
60°
19
82°
60°
20
77°
58°
21
77°
56°
22
78°
63°
23
69°
57°
24
N/A
25
76°
59°
26
76°
63°
27
76°
59°
28
72°
55°
29
72°
59°
30
77°
62°
31
73°
59°
1
72°
58°
2
71°
58°
3
73°
59°
4
73°
58°
5
74°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Markham
Markham's August 2026 forecast shows daily high temperatures ranging from 71° to 77°, with overnight lows between 55° and 63°. The average high for August is 74° with an average low of 59°. 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.
