S
M
T
W
T
F
S
27
76°
54°
28
N/A
29
71°
61°
30
74°
56°
1
74°
63°
2
67°
47°
3
62°
46°
4
71°
46°
5
61°
42°
6
58°
38°
7
73°
15°
8
66°
15°
9
69°
44°
10
60°
39°
11
63°
48°
12
71°
19°
13
84°
15°
14
61°
50°
15
55°
15°
16
65°
40°
17
51°
34°
18
65°
38°
19
70°
46°
20
63°
43°
21
59°
39°
22
65°
39°
23
53°
40°
24
57°
43°
25
63°
47°
26
62°
42°
27
53°
46°
28
54°
45°
29
56°
45°
30
58°
46°
31
48°
42°
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 48° to 65°, with overnight lows between 39° and 47°. The average high for October is 57° with an average low of 44°. 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.
