S
M
T
W
T
F
S
30
83°
53°
31
77°
50°
1
76°
51°
2
75°
51°
3
75°
52°
4
76°
51°
5
74°
51°
6
74°
52°
7
73°
56°
8
74°
55°
9
73°
50°
10
73°
50°
11
72°
51°
12
72°
50°
13
73°
51°
14
72°
52°
15
71°
54°
16
71°
48°
17
72°
47°
18
71°
48°
19
71°
55°
20
76°
55°
21
Hist. Avg.
73°
50°
22
Hist. Avg.
73°
49°
23
Hist. Avg.
72°
49°
24
Hist. Avg.
72°
49°
25
Hist. Avg.
72°
48°
26
Hist. Avg.
71°
48°
27
Hist. Avg.
71°
48°
28
Hist. Avg.
70°
47°
29
Hist. Avg.
70°
47°
30
Hist. Avg.
70°
46°
1
Hist. Avg.
69°
46°
2
Hist. Avg.
69°
46°
3
Hist. Avg.
68°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Indiana
Indiana's September 2026 forecast shows daily high temperatures ranging from 71° to 83°, with overnight lows between 47° and 56°. The average high for September is 74° with an average low of 52°. 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 Indiana. See also: October | November | December.
