S
M
T
W
T
F
S
26
82°
58°
27
83°
72°
28
79°
67°
29
69°
60°
30
66°
52°
1
69°
49°
2
73°
44°
3
80°
41°
4
81°
60°
5
73°
60°
6
60°
50°
7
71°
46°
8
75°
46°
9
84°
55°
10
78°
59°
11
76°
52°
12
80°
47°
13
86°
53°
14
79°
61°
15
89°
68°
16
85°
67°
17
90°
72°
18
85°
68°
19
78°
61°
20
81°
60°
21
80°
59°
22
82°
57°
23
80°
57°
24
84°
60°
25
86°
63°
26
83°
59°
27
83°
64°
28
84°
65°
29
83°
64°
30
82°
63°
31
81°
61°
1
81°
63°
2
82°
64°
3
82°
65°
4
86°
66°
5
86°
66°
6
83°
65°
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 90°, with overnight lows between 53° and 72°. The average high for May is 83° with an average low of 63°. 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.
