S
M
T
W
T
F
S
26
95°
77°
27
97°
77°
28
98°
77°
29
96°
77°
30
96°
75°
31
94°
76°
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°
75°
11
89°
73°
12
91°
73°
13
92°
72°
14
91°
74°
15
87°
70°
16
88°
69°
17
91°
74°
18
90°
74°
19
92°
74°
20
93°
75°
21
92°
74°
22
91°
74°
23
90°
73°
24
91°
74°
25
91°
74°
26
90°
73°
27
91°
74°
28
91°
74°
29
92°
72°
30
91°
73°
31
91°
73°
1
90°
72°
2
91°
73°
3
92°
73°
4
88°
72°
5
89°
71°
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 87° to 94°, with overnight lows between 69° and 75°. The average high for August is 91° with an average low of 73°. 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.
