S
M
T
W
T
F
S
27
89°
70°
28
89°
75°
29
88°
75°
30
89°
78°
1
90°
78°
2
89°
74°
3
88°
75°
4
80°
75°
5
84°
72°
6
88°
71°
7
93°
72°
8
92°
68°
9
92°
64°
10
90°
63°
11
89°
69°
12
90°
73°
13
93°
80°
14
91°
75°
15
91°
68°
16
79°
60°
17
72°
50°
18
76°
50°
19
81°
53°
20
83°
55°
21
83°
63°
22
86°
57°
23
86°
53°
24
86°
60°
25
83°
61°
26
85°
61°
27
82°
67°
28
81°
68°
29
84°
65°
30
79°
65°
31
86°
65°
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 ° to °, with overnight lows between ° and °. The average high for October is ° with an average low of °. 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.
