S
M
T
W
T
F
S
29
40°
32°
30
44°
27°
1
45°
23°
2
40°
20°
3
31°
21°
4
32°
25°
5
34°
24°
6
36°
22°
7
33°
25°
8
34°
22°
9
37°
19°
10
29°
19°
11
27°
17°
12
27°
19°
13
28°
13°
14
30°
12°
15
24°
16°
16
25°
19°
17
31°
12°
18
33°
8°
19
33°
16°
20
27°
13°
21
26°
10°
22
25°
7°
23
21°
8°
24
20°
17°
25
27°
14°
26
33°
3°
27
30°
3°
28
Hist. Avg.
28°
11°
29
Hist. Avg.
27°
11°
30
Hist. Avg.
27°
11°
31
Hist. Avg.
27°
11°
1
Hist. Avg.
27°
10°
2
Hist. Avg.
26°
10°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Montreal
Montreal's December 2026 forecast shows daily high temperatures ranging from 20° to 45°, with overnight lows between 3° and 32°. 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.
