S
M
T
W
T
F
S
29
41°
27°
30
43°
28°
1
43°
30°
2
42°
26°
3
40°
19°
4
38°
18°
5
29°
29°
6
36°
31°
7
39°
30°
8
45°
29°
9
30°
18°
10
46°
32°
11
47°
29°
12
Hist. Avg.
36°
22°
13
Hist. Avg.
36°
22°
14
Hist. Avg.
35°
21°
15
Hist. Avg.
35°
21°
16
Hist. Avg.
35°
21°
17
Hist. Avg.
34°
20°
18
Hist. Avg.
34°
20°
19
Hist. Avg.
34°
20°
20
Hist. Avg.
34°
20°
21
Hist. Avg.
33°
20°
22
Hist. Avg.
33°
19°
23
Hist. Avg.
33°
19°
24
Hist. Avg.
33°
19°
25
Hist. Avg.
33°
19°
26
Hist. Avg.
32°
18°
27
Hist. Avg.
32°
18°
28
Hist. Avg.
32°
18°
29
Hist. Avg.
32°
18°
30
Hist. Avg.
32°
18°
31
Hist. Avg.
32°
17°
1
Hist. Avg.
32°
17°
2
Hist. Avg.
32°
17°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Markham
Markham's December 2026 forecast shows daily high temperatures ranging from 29° to 47°, with overnight lows between 18° and 32°. The average high for December is 40° with an average low of 27°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Markham. See also: January | February | March.
