S
M
T
W
T
F
S
26
66°
36°
27
72°
37°
28
64°
37°
29
55°
42°
30
46°
42°
1
60°
42°
2
45°
36°
3
51°
41°
4
65°
38°
5
73°
47°
6
61°
51°
7
63°
45°
8
57°
38°
9
60°
33°
10
66°
46°
11
61°
42°
12
57°
37°
13
53°
37°
14
59°
48°
15
59°
45°
16
76°
56°
17
78°
46°
18
73°
49°
19
80°
64°
20
75°
52°
21
67°
45°
22
65°
46°
23
66°
46°
24
68°
48°
25
69°
50°
26
68°
54°
27
72°
47°
28
64°
48°
29
64°
49°
30
63°
52°
31
64°
52°
1
67°
51°
2
65°
51°
3
65°
50°
4
66°
48°
5
66°
53°
6
67°
54°
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 59° to 80°, with overnight lows between 45° and 64°. The average high for May is 68° with an average low of 50°. 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.
