S
M
T
W
T
F
S
26
85°
70°
27
88°
74°
28
85°
71°
29
73°
60°
30
64°
58°
1
63°
53°
2
76°
49°
3
82°
49°
4
81°
55°
5
87°
68°
6
68°
54°
7
71°
50°
8
80°
53°
9
85°
64°
10
80°
64°
11
79°
61°
12
82°
50°
13
87°
63°
14
89°
66°
15
88°
66°
16
89°
70°
17
89°
73°
18
90°
72°
19
81°
68°
20
81°
67°
21
84°
65°
22
83°
65°
23
82°
63°
24
84°
67°
25
86°
68°
26
85°
65°
27
87°
69°
28
88°
68°
29
84°
69°
30
82°
69°
31
84°
68°
1
82°
69°
2
84°
70°
3
87°
70°
4
88°
71°
5
89°
71°
6
84°
70°
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 90°, with overnight lows between 63° and 73°. The average high for May is 85° with an average low of 68°. 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.
