S
M
T
W
T
F
S
29
34°
25°
30
30°
23°
1
30°
21°
2
31°
18°
3
31°
23°
4
33°
21°
5
35°
24°
6
34°
22°
7
32°
25°
8
32°
25°
9
33°
23°
10
27°
17°
11
36°
20°
12
36°
21°
13
29°
20°
14
28°
15°
15
31°
2°
16
29°
7°
17
23°
18°
18
34°
7°
19
34°
5°
20
22°
16°
21
23°
20°
22
32°
20°
23
33°
21°
24
33°
20°
25
32°
14°
26
33°
12°
27
31°
7°
28
21°
6°
29
19°
17°
30
30°
18°
31
32°
16°
1
32°
20°
2
33°
16°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Montreal
Montreal's December 2026 forecast shows daily high temperatures ranging from 19° to 36°, with overnight lows between 2° and 25°. The average high for December is 31° with an average low of 17°. 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 Montreal. See also: January | February | March.
