S
M
T
W
T
F
S
26
82°
66°
27
86°
63°
28
85°
68°
29
85°
65°
30
77°
66°
1
66°
55°
2
73°
51°
3
77°
43°
4
78°
48°
5
81°
54°
6
81°
68°
7
78°
64°
8
71°
64°
9
68°
64°
10
84°
64°
11
84°
65°
12
82°
67°
13
84°
62°
14
85°
57°
15
84°
55°
16
83°
59°
17
83°
62°
18
87°
68°
19
89°
70°
20
88°
69°
21
87°
71°
22
82°
68°
23
83°
70°
24
79°
70°
25
80°
69°
26
78°
70°
27
82°
68°
28
78°
70°
29
82°
67°
30
83°
68°
31
85°
67°
1
86°
64°
2
86°
68°
3
85°
67°
4
85°
66°
5
87°
67°
6
85°
70°
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 78° to 87°, with overnight lows between 64° and 70°. The average high for May is 83° with an average low of 68°. 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.
