S
M
T
W
T
F
S
26
70°
38°
27
61°
44°
28
56°
45°
29
65°
42°
30
70°
46°
1
68°
45°
2
71°
49°
3
78°
48°
4
74°
52°
5
69°
49°
6
66°
48°
7
65°
47°
8
67°
50°
9
66°
49°
10
66°
51°
11
65°
50°
12
64°
46°
13
59°
49°
14
62°
45°
15
67°
47°
16
64°
48°
17
61°
49°
18
61°
48°
19
64°
47°
20
64°
50°
21
61°
50°
22
62°
46°
23
66°
47°
24
70°
51°
25
72°
52°
26
72°
52°
27
67°
51°
28
68°
49°
29
68°
51°
30
71°
53°
31
67°
52°
1
63°
52°
2
66°
51°
3
67°
52°
4
63°
51°
5
65°
50°
6
70°
53°
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 78°, with overnight lows between 42° and 53°. The average high for May is 67° 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.
