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°
46°
3
75°
49°
4
80°
55°
5
84°
60°
6
88°
64°
7
79°
51°
8
77°
52°
9
81°
57°
10
82°
62°
11
82°
59°
12
83°
60°
13
82°
61°
14
84°
60°
15
83°
58°
16
81°
56°
17
82°
58°
18
83°
62°
19
86°
62°
20
88°
63°
21
83°
63°
22
84°
58°
23
82°
57°
24
82°
57°
25
83°
61°
26
84°
61°
27
82°
59°
28
84°
61°
29
85°
60°
30
84°
65°
31
85°
66°
1
86°
66°
2
87°
67°
3
85°
67°
4
86°
66°
5
88°
67°
6
88°
67°
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 64° to 88°, with overnight lows between 46° and 67°. The average high for May is 83° 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.
