S
M
T
W
T
F
S
26
94°
74°
27
95°
73°
28
96°
72°
29
97°
79°
30
94°
75°
31
96°
72°
1
95°
75°
2
84°
73°
3
86°
71°
4
91°
72°
5
89°
71°
6
89°
72°
7
91°
71°
8
92°
72°
9
90°
71°
10
91°
72°
11
92°
71°
12
91°
69°
13
91°
71°
14
92°
70°
15
89°
70°
16
88°
69°
17
93°
71°
18
93°
72°
19
94°
73°
20
95°
72°
21
93°
72°
22
90°
71°
23
92°
72°
24
92°
72°
25
91°
71°
26
92°
72°
27
91°
72°
28
90°
71°
29
91°
70°
30
92°
71°
31
92°
71°
1
91°
70°
2
92°
70°
3
92°
68°
4
86°
66°
5
86°
67°
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 84° to 95°, with overnight lows between 66° and 75°. 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.
