S
M
T
W
T
F
S
27
59°
48°
28
60°
49°
29
62°
49°
30
63°
52°
1
66°
45°
2
57°
44°
3
56°
49°
4
61°
45°
5
60°
45°
6
54°
39°
7
55°
36°
8
54°
39°
9
59°
43°
10
63°
49°
11
65°
50°
12
63°
51°
13
64°
46°
14
64°
41°
15
60°
41°
16
60°
46°
17
56°
43°
18
58°
44°
19
57°
47°
20
58°
49°
21
63°
48°
22
63°
38°
23
62°
33°
24
58°
33°
25
45°
34°
26
46°
34°
27
46°
38°
28
50°
44°
29
56°
45°
30
55°
44°
31
58°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Markham
Markham's October 2026 forecast shows daily high temperatures ranging from 45° to 66°, with overnight lows between 33° and 52°. The average high for October is 58° with an average low of 43°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Markham. See also: November | December | January.
