S
M
T
W
T
F
S
26
91°
72°
27
92°
73°
28
93°
73°
29
93°
72°
30
92°
72°
31
90°
71°
1
91°
73°
2
92°
73°
3
92°
72°
4
91°
73°
5
92°
72°
6
91°
73°
7
88°
66°
8
88°
66°
9
87°
61°
10
84°
63°
11
83°
63°
12
87°
65°
13
82°
65°
14
81°
63°
15
82°
68°
16
87°
67°
17
88°
64°
18
83°
62°
19
81°
61°
20
81°
60°
21
82°
60°
22
84°
64°
23
87°
66°
24
89°
67°
25
90°
66°
26
89°
66°
27
88°
60°
28
86°
60°
29
81°
60°
30
80°
59°
31
79°
58°
1
80°
56°
2
78°
56°
3
78°
55°
4
79°
57°
5
79°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Vandalia
Vandalia's August 2026 forecast shows daily high temperatures ranging from 78° to 93°, with overnight lows between 55° and 73°. The average high for August is 86° with an average low of 65°. 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 Vandalia. See also: September | October | November.
