S
M
T
W
T
F
S
26
87°
70°
27
88°
71°
28
89°
71°
29
89°
70°
30
88°
71°
31
86°
70°
1
89°
71°
2
90°
72°
3
90°
72°
4
89°
71°
5
90°
72°
6
90°
72°
7
91°
71°
8
89°
70°
9
87°
69°
10
87°
69°
11
89°
71°
12
89°
71°
13
88°
70°
14
89°
71°
15
89°
69°
16
88°
66°
17
89°
66°
18
84°
68°
19
86°
63°
20
85°
66°
21
88°
67°
22
87°
66°
23
83°
63°
24
81°
62°
25
80°
61°
26
80°
60°
27
81°
59°
28
80°
60°
29
80°
60°
30
81°
65°
31
84°
65°
1
83°
64°
2
86°
65°
3
86°
64°
4
85°
60°
5
79°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Mount Vernon
Mount Vernon's August 2026 forecast shows daily high temperatures ranging from 79° to 91°, with overnight lows between 59° and 72°. The average high for August is 86° 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 August weather will actually feel in Mount Vernon. See also: September | October | November.
