S
M
T
W
T
F
S
26
70°
38°
27
61°
44°
28
56°
45°
29
65°
41°
30
72°
42°
1
71°
46°
2
74°
48°
3
76°
48°
4
80°
48°
5
68°
48°
6
59°
47°
7
65°
49°
8
62°
46°
9
68°
50°
10
67°
49°
11
70°
46°
12
80°
44°
13
59°
48°
14
59°
48°
15
53°
45°
16
58°
43°
17
65°
43°
18
66°
46°
19
64°
48°
20
67°
47°
21
73°
42°
22
76°
47°
23
66°
49°
24
72°
48°
25
62°
49°
26
64°
46°
27
72°
47°
28
74°
50°
29
61°
47°
30
63°
45°
31
62°
45°
1
67°
51°
2
74°
54°
3
70°
53°
4
69°
53°
5
70°
51°
6
70°
51°
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 61° to 74°, with overnight lows between 45° and 54°. The average high for May is 68° with an average low of 49°. 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.
