S
M
T
W
T
F
S
26
77°
52°
27
81°
50°
28
73°
58°
29
66°
51°
30
61°
42°
1
63°
36°
2
56°
36°
3
63°
32°
4
77°
49°
5
71°
59°
6
60°
49°
7
63°
44°
8
71°
36°
9
72°
51°
10
77°
51°
11
71°
47°
12
77°
43°
13
75°
52°
14
63°
40°
15
71°
38°
16
82°
55°
17
88°
61°
18
89°
66°
19
87°
67°
20
82°
64°
21
66°
55°
22
71°
57°
23
79°
66°
24
75°
62°
25
79°
62°
26
73°
67°
27
78°
64°
28
79°
53°
29
77°
60°
30
75°
54°
31
72°
51°
1
76°
54°
2
74°
53°
3
76°
56°
4
75°
59°
5
77°
62°
6
79°
63°
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 72° to 79°, with overnight lows between 51° and 67°. The average high for May is 76° with an average low of 58°. 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.
