S
M
T
W
T
F
S
26
67°
50°
27
70°
46°
28
75°
48°
29
81°
48°
30
86°
51°
1
84°
54°
2
77°
55°
3
69°
54°
4
62°
53°
5
68°
53°
6
74°
59°
7
83°
56°
8
86°
55°
9
88°
58°
10
88°
58°
11
93°
57°
12
93°
59°
13
82°
57°
14
91°
58°
15
91°
60°
16
86°
61°
17
84°
61°
18
89°
62°
19
94°
63°
20
96°
65°
21
95°
64°
22
94°
63°
23
90°
61°
24
89°
59°
25
87°
60°
26
85°
61°
27
86°
57°
28
81°
56°
29
80°
54°
30
81°
55°
31
87°
58°
1
90°
60°
2
90°
63°
3
91°
62°
4
82°
57°
5
85°
61°
6
90°
59°
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 80° to 96°, with overnight lows between 54° and 65°. The average high for May is 88° 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.
