S
M
T
W
T
F
S
26
N/A
27
72°
52°
28
72°
53°
29
64°
48°
30
51°
37°
1
46°
36°
2
48°
36°
3
50°
42°
4
52°
44°
5
60°
48°
6
59°
45°
7
59°
47°
8
57°
44°
9
57°
45°
10
56°
43°
11
62°
42°
12
66°
47°
13
61°
41°
14
57°
38°
15
57°
38°
16
58°
39°
17
59°
41°
18
59°
41°
19
69°
47°
20
60°
44°
21
59°
41°
22
58°
42°
23
59°
41°
24
61°
43°
25
62°
47°
26
61°
44°
27
60°
43°
28
63°
51°
29
71°
53°
30
73°
52°
31
67°
49°
1
72°
54°
2
72°
55°
3
74°
55°
4
74°
50°
5
65°
48°
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 46° to 74°, with overnight lows between 36° and 55°. The average high for May is 62° 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.
