S
M
T
W
T
F
S
26
61°
43°
27
71°
43°
28
72°
54°
29
55°
47°
30
52°
40°
1
44°
36°
2
45°
37°
3
59°
32°
4
71°
48°
5
69°
48°
6
56°
44°
7
57°
39°
8
57°
43°
9
68°
50°
10
61°
45°
11
62°
38°
12
65°
38°
13
67°
43°
14
59°
42°
15
68°
36°
16
69°
49°
17
82°
57°
18
86°
63°
19
86°
65°
20
66°
48°
21
66°
48°
22
60°
47°
23
72°
54°
24
69°
60°
25
75°
54°
26
80°
61°
27
78°
59°
28
79°
51°
29
72°
51°
30
70°
50°
31
71°
51°
1
73°
55°
2
74°
54°
3
75°
58°
4
75°
58°
5
78°
60°
6
77°
56°
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 50° and 61°. The average high for May is 75° with an average low of 56°. 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.
