S
M
T
W
T
F
S
26
76°
59°
27
83°
62°
28
82°
66°
29
78°
59°
30
84°
57°
31
85°
60°
1
79°
67°
2
80°
64°
3
78°
60°
4
83°
64°
5
79°
64°
6
81°
64°
7
81°
63°
8
83°
62°
9
81°
61°
10
78°
61°
11
78°
58°
12
78°
59°
13
77°
58°
14
80°
57°
15
75°
54°
16
75°
54°
17
84°
62°
18
83°
61°
19
84°
61°
20
82°
60°
21
81°
58°
22
83°
60°
23
84°
61°
24
84°
61°
25
81°
60°
26
81°
60°
27
80°
59°
28
80°
58°
29
79°
59°
30
78°
58°
31
80°
58°
1
82°
57°
2
76°
52°
3
73°
52°
4
76°
53°
5
78°
54°
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 73° to 84°, with overnight lows between 52° and 67°. The average high for August is 80° 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.
