S
M
T
W
T
F
S
26
65°
46°
27
68°
48°
28
67°
46°
29
65°
43°
30
64°
45°
1
72°
48°
2
66°
45°
3
67°
54°
4
71°
55°
5
69°
54°
6
70°
53°
7
71°
52°
8
74°
57°
9
75°
56°
10
76°
55°
11
78°
59°
12
79°
59°
13
79°
54°
14
70°
50°
15
71°
53°
16
74°
57°
17
80°
60°
18
79°
59°
19
76°
51°
20
70°
50°
21
71°
51°
22
73°
59°
23
75°
56°
24
81°
61°
25
83°
62°
26
83°
62°
27
82°
63°
28
81°
63°
29
82°
62°
30
82°
63°
31
77°
62°
1
83°
60°
2
79°
63°
3
79°
58°
4
78°
57°
5
80°
59°
6
83°
61°
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 83°, with overnight lows between 43° and 63°. The average high for May is 75° with an average low of 56°. 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.
