S
M
T
W
T
F
S
27
77°
57°
28
76°
57°
29
75°
56°
30
75°
53°
1
72°
50°
2
67°
55°
3
73°
54°
4
75°
56°
5
74°
55°
6
73°
54°
7
73°
55°
8
72°
53°
9
71°
53°
10
70°
51°
11
71°
43°
12
58°
39°
13
57°
40°
14
57°
41°
15
58°
40°
16
57°
39°
17
56°
37°
18
54°
37°
19
54°
39°
20
55°
41°
21
54°
41°
22
55°
45°
23
70°
40°
24
68°
40°
25
58°
36°
26
57°
34°
27
51°
31°
28
49°
37°
29
50°
43°
30
51°
34°
31
55°
31°
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 49° to 77°, with overnight lows between 31° and 57°. The average high for October is 63° with an average low of 45°. 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.
