S
M
T
W
T
F
S
26
89°
69°
27
91°
70°
28
86°
68°
29
84°
62°
30
86°
64°
31
85°
68°
1
79°
68°
2
80°
67°
3
84°
64°
4
85°
65°
5
86°
65°
6
82°
70°
7
89°
70°
8
90°
72°
9
89°
72°
10
90°
76°
11
90°
67°
12
73°
68°
13
86°
67°
14
81°
70°
15
84°
73°
16
89°
71°
17
84°
68°
18
83°
63°
19
81°
67°
20
83°
65°
21
85°
64°
22
82°
66°
23
81°
61°
24
78°
57°
25
80°
58°
26
85°
63°
27
83°
65°
28
84°
61°
29
84°
64°
30
89°
69°
31
90°
70°
1
91°
71°
2
91°
72°
3
87°
66°
4
89°
65°
5
85°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Indianapolis
Indianapolis's August 2026 forecast shows daily high temperatures ranging from 84° to 91°, with overnight lows between 61° and 72°. The average high for August is 88° 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 Indianapolis. See also: September | October | November.
