S
M
T
W
T
F
S
26
88°
69°
27
90°
70°
28
90°
70°
29
89°
69°
30
90°
71°
31
90°
70°
1
91°
71°
2
92°
72°
3
91°
71°
4
92°
70°
5
92°
71°
6
91°
71°
7
93°
70°
8
90°
69°
9
88°
68°
10
87°
68°
11
90°
70°
12
91°
71°
13
91°
71°
14
90°
70°
15
91°
69°
16
90°
66°
17
90°
65°
18
87°
64°
19
88°
62°
20
88°
66°
21
91°
67°
22
90°
66°
23
86°
64°
24
84°
63°
25
83°
62°
26
83°
61°
27
84°
60°
28
83°
61°
29
83°
63°
30
84°
64°
31
86°
65°
1
88°
65°
2
88°
64°
3
87°
64°
4
88°
59°
5
82°
63°
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 82° to 93°, with overnight lows between 59° and 72°. The average high for August is 88° 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.
