S
M
T
W
T
F
S
26
87°
64°
27
76°
55°
28
78°
51°
29
89°
63°
30
84°
68°
1
73°
62°
2
64°
55°
3
74°
50°
4
81°
50°
5
85°
54°
6
90°
60°
7
81°
67°
8
76°
62°
9
72°
62°
10
86°
64°
11
88°
64°
12
72°
61°
13
77°
59°
14
84°
62°
15
83°
55°
16
90°
58°
17
93°
69°
18
92°
65°
19
91°
65°
20
92°
67°
21
92°
69°
22
91°
70°
23
90°
71°
24
90°
68°
25
90°
67°
26
92°
68°
27
91°
67°
28
88°
67°
29
87°
65°
30
86°
64°
31
85°
65°
1
86°
64°
2
91°
68°
3
90°
67°
4
85°
67°
5
86°
66°
6
87°
68°
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 85° to 92°, with overnight lows between 64° and 71°. The average high for May is 89° with an average low of 67°. 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.
