S
M
T
W
T
F
S
26
74°
45°
27
74°
49°
28
60°
46°
29
59°
39°
30
55°
35°
1
55°
35°
2
60°
32°
3
76°
47°
4
82°
43°
5
59°
42°
6
56°
36°
7
66°
31°
8
73°
40°
9
71°
45°
10
70°
37°
11
69°
38°
12
79°
49°
13
72°
46°
14
77°
45°
15
84°
58°
16
83°
61°
17
82°
62°
18
74°
62°
19
65°
46°
20
64°
43°
21
66°
48°
22
66°
51°
23
75°
52°
24
81°
49°
25
85°
57°
26
86°
59°
27
91°
62°
28
84°
58°
29
83°
61°
30
87°
59°
31
81°
58°
1
88°
55°
2
88°
57°
3
83°
59°
4
82°
60°
5
84°
59°
6
85°
60°
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 81° to 91°, with overnight lows between 55° and 62°. The average high for May is 85° with an average low of 59°. 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.
