S
M
T
W
T
F
S
26
49°
39°
27
47°
38°
28
51°
32°
29
59°
31°
30
56°
33°
1
56°
29°
2
73°
34°
3
73°
46°
4
63°
36°
5
53°
30°
6
58°
27°
7
66°
30°
8
79°
42°
9
64°
42°
10
69°
37°
11
86°
41°
12
77°
47°
13
82°
38°
14
82°
50°
15
85°
43°
16
82°
44°
17
77°
50°
18
51°
42°
19
57°
39°
20
65°
36°
21
72°
49°
22
67°
50°
23
78°
45°
24
90°
49°
25
92°
60°
26
97°
73°
27
95°
58°
28
92°
62°
29
73°
66°
30
78°
64°
31
84°
59°
1
83°
63°
2
85°
63°
3
78°
63°
4
80°
62°
5
84°
63°
6
88°
65°
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 78° to 88°, with overnight lows between 59° and 65°. The average high for May is 83° with an average low of 63°. 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.
