S
M
T
W
T
F
S
26
96°
73°
27
96°
73°
28
95°
72°
29
96°
74°
30
97°
74°
31
97°
73°
1
96°
73°
2
96°
72°
3
95°
73°
4
96°
73°
5
96°
72°
6
95°
73°
7
91°
65°
8
93°
69°
9
94°
67°
10
91°
66°
11
90°
65°
12
92°
68°
13
91°
68°
14
90°
70°
15
91°
70°
16
92°
69°
17
95°
70°
18
95°
69°
19
89°
65°
20
88°
64°
21
88°
64°
22
89°
65°
23
94°
66°
24
95°
67°
25
94°
68°
26
91°
65°
27
88°
67°
28
91°
67°
29
89°
65°
30
90°
66°
31
87°
63°
1
86°
61°
2
86°
60°
3
85°
59°
4
84°
59°
5
85°
60°
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 97°, with overnight lows between 59° and 74°. The average high for August is 92° with an average low of 68°. 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.
