S
M
T
W
T
F
S
26
83°
61°
27
79°
55°
28
77°
56°
29
79°
60°
30
80°
58°
31
79°
56°
1
81°
54°
2
78°
54°
3
78°
55°
4
79°
54°
5
78°
55°
6
78°
58°
7
79°
59°
8
77°
60°
9
77°
61°
10
79°
60°
11
78°
61°
12
79°
56°
13
82°
59°
14
85°
54°
15
77°
53°
16
78°
54°
17
81°
59°
18
83°
55°
19
77°
54°
20
77°
52°
21
78°
53°
22
78°
55°
23
76°
58°
24
76°
52°
25
77°
58°
26
82°
60°
27
82°
60°
28
83°
59°
29
84°
52°
30
84°
50°
31
75°
54°
1
76°
53°
2
76°
58°
3
81°
54°
4
78°
50°
5
76°
55°
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 75° to 85°, with overnight lows between 50° and 61°. The average high for August is 79° with an average low of 56°. 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.
