S
M
T
W
T
F
S
26
79°
55°
27
82°
57°
28
63°
50°
29
61°
45°
30
63°
43°
1
63°
43°
2
63°
41°
3
79°
43°
4
79°
61°
5
61°
45°
6
61°
45°
7
66°
37°
8
77°
52°
9
81°
50°
10
68°
48°
11
73°
43°
12
77°
54°
13
73°
57°
14
77°
52°
15
82°
59°
16
86°
66°
17
81°
64°
18
84°
72°
19
72°
55°
20
59°
54°
21
72°
55°
22
72°
61°
23
77°
57°
24
80°
56°
25
82°
60°
26
76°
61°
27
80°
62°
28
78°
63°
29
76°
59°
30
79°
60°
31
78°
59°
1
74°
59°
2
76°
60°
3
77°
59°
4
78°
60°
5
82°
63°
6
81°
61°
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 74° to 82°, with overnight lows between 56° and 63°. The average high for May is 78° with an average low of 60°. 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.
