S
M
T
W
T
F
S
30
81°
68°
31
93°
72°
1
97°
75°
2
99°
79°
3
95°
79°
4
95°
77°
5
84°
73°
6
79°
70°
7
82°
61°
8
88°
63°
9
81°
70°
10
77°
59°
11
82°
55°
12
90°
66°
13
73°
55°
14
72°
52°
15
88°
66°
16
73°
68°
17
84°
70°
18
75°
64°
19
72°
64°
20
70°
59°
21
68°
57°
22
64°
55°
23
64°
57°
24
70°
57°
25
66°
55°
26
70°
50°
27
72°
46°
28
64°
52°
29
68°
52°
30
68°
61°
1
77°
62°
2
69°
49°
3
70°
50°
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 69° to 70°, with overnight lows between 49° and 50°. The average high for September is 70° with an average low of 50°. 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.
