S
M
T
W
T
F
S
26
71°
53°
27
70°
51°
28
69°
52°
29
66°
46°
30
63°
53°
1
64°
52°
2
68°
51°
3
66°
48°
4
69°
50°
5
72°
53°
6
74°
56°
7
75°
57°
8
75°
57°
9
76°
56°
10
75°
57°
11
68°
55°
12
69°
56°
13
73°
58°
14
73°
51°
15
68°
51°
16
71°
56°
17
76°
60°
18
71°
52°
19
71°
51°
20
72°
53°
21
70°
52°
22
71°
53°
23
69°
61°
24
76°
62°
25
80°
62°
26
80°
61°
27
82°
63°
28
81°
63°
29
84°
62°
30
83°
56°
31
80°
55°
1
75°
58°
2
80°
63°
3
82°
64°
4
80°
61°
5
84°
55°
6
76°
56°
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 63° to 84°, with overnight lows between 46° and 64°. The average high for May is 74° 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.
