S
M
T
W
T
F
S
30
76°
57°
31
77°
57°
1
76°
58°
2
76°
57°
3
77°
57°
4
77°
58°
5
78°
60°
6
77°
61°
7
75°
60°
8
76°
56°
9
74°
55°
10
75°
54°
11
74°
54°
12
74°
55°
13
75°
56°
14
73°
57°
15
80°
61°
16
80°
62°
17
79°
61°
18
79°
52°
19
78°
51°
20
72°
52°
21
70°
58°
22
72°
58°
23
76°
58°
24
77°
59°
25
76°
49°
26
75°
47°
27
68°
48°
28
66°
49°
29
67°
49°
30
67°
47°
1
Hist. Avg.
70°
48°
2
Hist. Avg.
69°
47°
3
Hist. Avg.
69°
47°
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 66° to 80°, with overnight lows between 47° and 62°. The average high for September is 75° with an average low of 55°. 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.
