S
M
T
W
T
F
S
26
56°
28°
27
59°
31°
28
66°
36°
29
66°
44°
30
71°
31°
1
79°
38°
2
83°
51°
3
82°
41°
4
80°
39°
5
79°
44°
6
81°
46°
7
77°
44°
8
75°
36°
9
79°
38°
10
84°
35°
11
79°
41°
12
92°
36°
13
68°
44°
14
70°
36°
15
66°
39°
16
55°
35°
17
54°
33°
18
66°
31°
19
68°
35°
20
70°
40°
21
71°
39°
22
76°
40°
23
82°
45°
24
82°
43°
25
84°
48°
26
49°
39°
27
68°
43°
28
75°
45°
29
63°
42°
30
66°
36°
31
70°
41°
1
77°
46°
2
80°
51°
3
77°
44°
4
82°
46°
5
80°
45°
6
75°
44°
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 82°, with overnight lows between 36° and 51°. The average high for May is 75° with an average low of 44°. 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.
