S
M
T
W
T
F
S
26
87°
64°
27
76°
55°
28
78°
51°
29
89°
63°
30
84°
68°
1
73°
62°
2
64°
55°
3
74°
50°
4
81°
50°
5
85°
54°
6
90°
60°
7
81°
67°
8
76°
62°
9
72°
62°
10
86°
64°
11
88°
64°
12
72°
61°
13
77°
59°
14
84°
62°
15
83°
55°
16
90°
58°
17
93°
69°
18
92°
65°
19
92°
64°
20
93°
65°
21
94°
66°
22
90°
70°
23
84°
70°
24
85°
72°
25
86°
71°
26
87°
71°
27
87°
67°
28
86°
68°
29
84°
65°
30
81°
63°
31
82°
63°
1
85°
66°
2
86°
68°
3
87°
68°
4
86°
65°
5
90°
67°
6
90°
68°
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 81° to 90°, with overnight lows between 63° and 72°. The average high for May is 86° 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.
