S
M
T
W
T
F
S
26
57°
43°
27
68°
49°
28
64°
50°
29
62°
49°
30
61°
48°
1
64°
48°
2
61°
51°
3
60°
46°
4
72°
52°
5
77°
55°
6
67°
57°
7
64°
51°
8
63°
49°
9
65°
52°
10
74°
51°
11
62°
54°
12
67°
48°
13
72°
54°
14
68°
54°
15
66°
52°
16
78°
55°
17
89°
67°
18
87°
67°
19
96°
71°
20
96°
66°
21
66°
56°
22
69°
56°
23
55°
46°
24
57°
53°
25
71°
62°
26
77°
64°
27
84°
65°
28
82°
57°
29
77°
58°
30
75°
55°
31
73°
58°
1
75°
60°
2
77°
61°
3
79°
61°
4
75°
62°
5
78°
60°
6
73°
56°
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 55° to 84°, with overnight lows between 46° and 65°. The average high for May is 74° with an average low of 59°. 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.
