S
M
T
W
T
F
S
26
90°
72°
27
89°
71°
28
93°
72°
29
94°
74°
30
94°
73°
31
93°
74°
1
94°
73°
2
94°
73°
3
90°
72°
4
93°
73°
5
92°
73°
6
92°
72°
7
94°
73°
8
93°
73°
9
94°
74°
10
94°
73°
11
93°
72°
12
92°
73°
13
93°
73°
14
91°
72°
15
89°
72°
16
86°
71°
17
87°
71°
18
88°
70°
19
88°
72°
20
89°
72°
21
88°
71°
22
89°
72°
23
89°
72°
24
92°
68°
25
93°
71°
26
93°
69°
27
91°
68°
28
92°
67°
29
91°
68°
30
92°
70°
31
93°
70°
1
92°
69°
2
88°
69°
3
87°
68°
4
87°
69°
5
88°
69°
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 67° and 74°. The average high for August is 91° with an average low of 71°. 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.
