S
M
T
W
T
F
S
30
81°
68°
31
93°
72°
1
96°
74°
2
97°
73°
3
90°
72°
4
92°
71°
5
87°
70°
6
84°
67°
7
78°
64°
8
76°
63°
9
77°
62°
10
79°
63°
11
76°
58°
12
77°
57°
13
76°
58°
14
75°
63°
15
80°
63°
16
80°
62°
17
79°
62°
18
79°
61°
19
80°
63°
20
80°
63°
21
79°
62°
22
80°
62°
23
80°
61°
24
79°
61°
25
79°
60°
26
78°
59°
27
79°
60°
28
78°
60°
29
76°
59°
30
76°
58°
1
76°
58°
2
75°
57°
3
76°
57°
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 75° to 97°, with overnight lows between 57° and 74°. The average high for September is 80° with an average low of 63°. 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.
