S
M
T
W
T
F
S
26
65°
44°
27
73°
50°
28
73°
54°
29
66°
53°
30
54°
41°
1
53°
40°
2
50°
37°
3
50°
41°
4
59°
51°
5
65°
46°
6
53°
43°
7
54°
40°
8
51°
41°
9
54°
40°
10
56°
46°
11
60°
47°
12
60°
46°
13
58°
47°
14
56°
44°
15
59°
41°
16
59°
41°
17
60°
42°
18
60°
49°
19
64°
49°
20
69°
50°
21
70°
48°
22
65°
43°
23
61°
47°
24
61°
45°
25
62°
45°
26
63°
46°
27
63°
49°
28
62°
51°
29
69°
53°
30
70°
47°
31
67°
44°
1
63°
44°
2
63°
45°
3
64°
45°
4
63°
48°
5
64°
46°
6
66°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Montreal
Montreal's May 2026 forecast shows daily high temperatures ranging from 50° to 70°, with overnight lows between 37° and 53°. The average high for May is 61° with an average low of 45°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Montreal. See also: June | July | August.
