S
M
T
W
T
F
S
26
83°
69°
27
83°
69°
28
83°
67°
29
85°
72°
30
84°
71°
31
87°
72°
1
86°
65°
2
84°
65°
3
83°
67°
4
82°
66°
5
81°
65°
6
82°
65°
7
83°
66°
8
82°
67°
9
82°
71°
10
83°
71°
11
82°
72°
12
82°
71°
13
85°
71°
14
87°
65°
15
86°
65°
16
82°
69°
17
83°
67°
18
84°
65°
19
81°
64°
20
80°
63°
21
81°
68°
22
80°
64°
23
80°
68°
24
81°
70°
25
80°
69°
26
84°
70°
27
84°
70°
28
85°
69°
29
85°
70°
30
84°
63°
31
80°
63°
1
79°
62°
2
78°
62°
3
78°
67°
4
77°
62°
5
82°
62°
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 77° to 87°, with overnight lows between 62° and 72°. The average high for August is 82° with an average low of 67°. 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.
