S
M
T
W
T
F
S
26
84°
60°
27
90°
68°
28
87°
62°
29
76°
56°
30
69°
52°
1
74°
50°
2
75°
45°
3
84°
46°
4
82°
58°
5
81°
56°
6
66°
52°
7
74°
44°
8
82°
49°
9
87°
58°
10
74°
62°
11
79°
56°
12
83°
51°
13
88°
58°
14
83°
57°
15
86°
63°
16
86°
71°
17
90°
72°
18
90°
75°
19
80°
64°
20
81°
64°
21
80°
67°
22
80°
67°
23
76°
65°
24
88°
65°
25
87°
64°
26
81°
67°
27
81°
69°
28
81°
68°
29
82°
68°
30
81°
67°
31
84°
62°
1
80°
62°
2
82°
61°
3
83°
62°
4
83°
62°
5
84°
66°
6
87°
68°
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 80° to 87°, with overnight lows between 61° and 69°. The average high for May is 82° with an average low of 65°. 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.
