S
M
T
W
T
F
S
26
62°
40°
27
71°
37°
28
66°
37°
29
65°
47°
30
58°
46°
1
63°
39°
2
59°
44°
3
58°
39°
4
73°
36°
5
83°
46°
6
71°
53°
7
62°
44°
8
60°
40°
9
55°
44°
10
68°
44°
11
61°
43°
12
66°
35°
13
64°
50°
14
61°
46°
15
61°
45°
16
77°
56°
17
80°
51°
18
80°
58°
19
89°
66°
20
77°
52°
21
69°
48°
22
69°
49°
23
68°
50°
24
69°
51°
25
68°
50°
26
72°
51°
27
67°
51°
28
68°
48°
29
68°
51°
30
69°
56°
31
75°
54°
1
69°
52°
2
70°
50°
3
69°
50°
4
70°
51°
5
71°
57°
6
74°
58°
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 61° to 89°, with overnight lows between 45° and 66°. The average high for May is 71° with an average low of 52°. 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.
