S
M
T
W
T
F
S
26
86°
64°
27
86°
63°
28
87°
64°
29
88°
64°
30
90°
67°
31
91°
69°
1
91°
67°
2
87°
68°
3
90°
69°
4
94°
69°
5
92°
63°
6
89°
63°
7
86°
64°
8
85°
62°
9
85°
63°
10
87°
63°
11
88°
64°
12
89°
63°
13
89°
68°
14
91°
67°
15
89°
65°
16
91°
66°
17
93°
62°
18
86°
61°
19
86°
66°
20
88°
68°
21
92°
66°
22
91°
67°
23
92°
68°
24
92°
68°
25
91°
67°
26
92°
68°
27
92°
68°
28
91°
67°
29
91°
68°
30
89°
66°
31
88°
64°
1
87°
63°
2
86°
63°
3
87°
62°
4
88°
64°
5
88°
65°
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 85° to 94°, with overnight lows between 61° and 69°. The average high for August is 89° with an average low of 65°. 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.
