S
M
T
W
T
F
S
26
81°
54°
27
82°
62°
28
72°
62°
29
68°
54°
30
65°
49°
1
62°
45°
2
57°
41°
3
67°
38°
4
82°
55°
5
68°
50°
6
61°
47°
7
65°
46°
8
72°
47°
9
78°
54°
10
75°
58°
11
75°
53°
12
80°
49°
13
78°
59°
14
71°
50°
15
81°
51°
16
83°
69°
17
89°
69°
18
85°
70°
19
80°
61°
20
70°
56°
21
70°
56°
22
74°
63°
23
75°
64°
24
80°
63°
25
79°
64°
26
80°
63°
27
79°
62°
28
79°
63°
29
81°
62°
30
80°
59°
31
83°
64°
1
84°
64°
2
84°
62°
3
79°
61°
4
77°
57°
5
77°
60°
6
82°
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 70° to 89°, with overnight lows between 56° and 70°. The average high for May is 79° with an average low of 62°. 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.
