S
M
T
W
T
F
S
26
82°
59°
27
86°
63°
28
90°
68°
29
92°
61°
30
87°
60°
31
85°
59°
1
82°
60°
2
82°
58°
3
83°
56°
4
82°
59°
5
83°
62°
6
84°
64°
7
87°
67°
8
91°
58°
9
87°
66°
10
90°
59°
11
90°
68°
12
91°
58°
13
90°
58°
14
85°
66°
15
89°
65°
16
90°
57°
17
81°
56°
18
81°
58°
19
80°
57°
20
85°
56°
21
82°
55°
22
79°
56°
23
80°
57°
24
86°
58°
25
79°
62°
26
84°
57°
27
79°
60°
28
78°
57°
29
82°
56°
30
83°
54°
31
78°
53°
1
76°
54°
2
76°
51°
3
77°
54°
4
77°
60°
5
78°
57°
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 76° to 92°, with overnight lows between 51° and 68°. The average high for August is 84° with an average low of 59°. 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.
