S
M
T
W
T
F
S
26
95°
77°
27
97°
77°
28
98°
77°
29
96°
77°
30
96°
75°
31
94°
75°
1
94°
74°
2
93°
69°
3
91°
70°
4
94°
73°
5
91°
74°
6
92°
73°
7
91°
74°
8
92°
73°
9
88°
73°
10
88°
72°
11
89°
73°
12
91°
73°
13
89°
72°
14
87°
74°
15
87°
70°
16
88°
69°
17
87°
71°
18
89°
73°
19
91°
74°
20
90°
69°
21
90°
70°
22
91°
73°
23
90°
73°
24
90°
72°
25
89°
73°
26
90°
69°
27
89°
68°
28
89°
70°
29
91°
72°
30
89°
73°
31
88°
73°
1
86°
72°
2
86°
72°
3
88°
71°
4
89°
72°
5
88°
72°
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 86° to 94°, with overnight lows between 68° and 75°. The average high for August is 90° with an average low of 72°. 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.
