S
M
T
W
T
F
S
30
76°
65°
31
83°
59°
1
78°
52°
2
82°
61°
3
85°
63°
4
89°
66°
5
88°
64°
6
81°
64°
7
76°
64°
8
79°
56°
9
72°
52°
10
71°
51°
11
74°
53°
12
69°
49°
13
67°
50°
14
69°
50°
15
71°
46°
16
73°
52°
17
74°
53°
18
75°
52°
19
74°
50°
20
68°
48°
21
68°
50°
22
67°
50°
23
72°
52°
24
73°
50°
25
69°
45°
26
59°
41°
27
61°
38°
28
57°
43°
29
69°
39°
30
57°
42°
1
60°
44°
2
55°
42°
3
56°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Gary
Gary's September 2026 forecast shows daily high temperatures ranging from 55° to 89°, with overnight lows between 38° and 66°. The average high for September is 71° with an average low of 51°. 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 Gary. See also: October | November | December.
