S
M
T
W
T
F
S
26
73°
55°
27
75°
54°
28
79°
58°
29
73°
56°
30
70°
54°
31
69°
52°
1
70°
56°
2
71°
52°
3
73°
54°
4
71°
52°
5
73°
53°
6
78°
58°
7
76°
57°
8
78°
57°
9
80°
58°
10
80°
58°
11
79°
57°
12
81°
59°
13
81°
59°
14
79°
58°
15
79°
58°
16
78°
57°
17
80°
58°
18
79°
58°
19
80°
57°
20
80°
58°
21
79°
58°
22
79°
57°
23
78°
58°
24
76°
49°
25
73°
55°
26
76°
56°
27
77°
57°
28
79°
56°
29
80°
52°
30
79°
57°
31
77°
55°
1
77°
51°
2
76°
49°
3
76°
48°
4
77°
48°
5
75°
47°
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 69° to 81°, with overnight lows between 47° and 59°. The average high for August is 77° with an average low of 55°. 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.
