S
M
T
W
T
F
S
26
82°
68°
27
82°
62°
28
81°
61°
29
82°
63°
30
85°
65°
31
87°
66°
1
85°
62°
2
81°
63°
3
82°
62°
4
80°
61°
5
81°
64°
6
82°
63°
7
82°
63°
8
81°
65°
9
81°
66°
10
82°
68°
11
81°
65°
12
81°
62°
13
87°
67°
14
88°
60°
15
82°
61°
16
82°
65°
17
87°
63°
18
87°
63°
19
83°
64°
20
82°
61°
21
81°
62°
22
84°
64°
23
84°
66°
24
81°
66°
25
81°
65°
26
82°
66°
27
87°
66°
28
88°
65°
29
88°
65°
30
87°
58°
31
81°
59°
1
82°
60°
2
86°
64°
3
85°
64°
4
85°
62°
5
83°
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 80° to 88°, with overnight lows between 58° and 68°. The average high for August is 83° with an average low of 64°. 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.
