S
M
T
W
T
F
S
30
78°
58°
31
81°
58°
1
80°
59°
2
79°
58°
3
77°
59°
4
81°
65°
5
77°
60°
6
76°
56°
7
76°
56°
8
77°
59°
9
75°
56°
10
74°
54°
11
74°
55°
12
76°
58°
13
82°
61°
14
83°
63°
15
84°
64°
16
82°
64°
17
83°
63°
18
83°
63°
19
80°
62°
20
81°
62°
21
80°
61°
22
80°
61°
23
79°
60°
24
81°
60°
25
80°
59°
26
81°
60°
27
80°
59°
28
76°
56°
29
76°
58°
30
79°
58°
1
76°
56°
2
72°
45°
3
66°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Indianapolis Motor Speedway
Indianapolis Motor Speedway's September 2026 forecast shows daily high temperatures ranging from 66° to 84°, with overnight lows between 44° and 65°. The average high for September is 78° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Indianapolis Motor Speedway. See also: October | November | December.
