S
M
T
W
T
F
S
26
102°
77°
27
103°
76°
28
103°
76°
29
98°
80°
30
96°
77°
31
103°
76°
1
90°
76°
2
92°
67°
3
94°
67°
4
95°
68°
5
98°
69°
6
100°
72°
7
100°
72°
8
90°
74°
9
99°
71°
10
100°
73°
11
101°
74°
12
103°
76°
13
103°
83°
14
103°
77°
15
103°
72°
16
105°
75°
17
93°
74°
18
101°
77°
19
103°
75°
20
103°
74°
21
99°
69°
22
94°
72°
23
96°
72°
24
91°
72°
25
94°
70°
26
94°
67°
27
94°
68°
28
93°
66°
29
92°
66°
30
97°
69°
31
97°
69°
1
99°
70°
2
89°
63°
3
84°
60°
4
92°
68°
5
92°
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 103°, with overnight lows between 60° and 74°. The average high for August is 94° 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.
