S
M
T
W
T
F
S
26
60°
44°
27
74°
44°
28
71°
54°
29
58°
45°
30
54°
39°
1
49°
37°
2
45°
32°
3
59°
32°
4
72°
46°
5
68°
50°
6
58°
41°
7
57°
38°
8
64°
41°
9
69°
50°
10
65°
46°
11
67°
36°
12
69°
40°
13
65°
45°
14
62°
42°
15
68°
37°
16
75°
48°
17
83°
59°
18
87°
64°
19
87°
64°
20
66°
48°
21
65°
48°
22
59°
50°
23
70°
57°
24
76°
60°
25
78°
59°
26
80°
61°
27
73°
60°
28
75°
51°
29
73°
51°
30
70°
48°
31
69°
49°
1
71°
52°
2
72°
54°
3
72°
53°
4
72°
55°
5
75°
53°
6
71°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mount Vernon
Mount Vernon's May 2026 forecast shows daily high temperatures ranging from 69° to 80°, with overnight lows between 48° and 61°. The average high for May is 73° with an average low of 55°. 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 Mount Vernon. See also: June | July | August.
