S
M
T
W
T
F
S
26
91°
70°
27
92°
71°
28
93°
72°
29
93°
75°
30
96°
74°
31
93°
72°
1
92°
73°
2
93°
73°
3
97°
76°
4
98°
72°
5
95°
75°
6
98°
70°
7
93°
70°
8
92°
71°
9
92°
71°
10
93°
73°
11
95°
73°
12
94°
72°
13
92°
75°
14
97°
71°
15
97°
70°
16
96°
72°
17
96°
74°
18
95°
73°
19
92°
74°
20
93°
74°
21
96°
73°
22
96°
74°
23
95°
74°
24
96°
73°
25
96°
74°
26
95°
73°
27
93°
74°
28
95°
74°
29
94°
72°
30
95°
73°
31
94°
72°
1
93°
71°
2
93°
72°
3
92°
71°
4
93°
71°
5
94°
72°
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 91° to 98°, with overnight lows between 70° and 76°. The average high for August is 94° 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.
