S
M
T
W
T
F
S
30
82°
64°
31
76°
61°
1
75°
61°
2
77°
64°
3
80°
65°
4
80°
65°
5
79°
64°
6
81°
64°
7
81°
61°
8
82°
64°
9
82°
60°
10
83°
53°
11
76°
60°
12
75°
63°
13
79°
52°
14
82°
49°
15
73°
48°
16
70°
49°
17
71°
51°
18
71°
58°
19
72°
59°
20
74°
58°
21
76°
57°
22
79°
58°
23
80°
57°
24
80°
57°
25
79°
59°
26
80°
54°
27
77°
47°
28
75°
44°
29
65°
46°
30
67°
45°
1
66°
49°
2
67°
45°
3
67°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Griffith
Griffith's September 2026 forecast shows daily high temperatures ranging from 65° to 83°, with overnight lows between 44° and 65°. The average high for September is 76° with an average low of 56°. 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 Griffith. See also: October | November | December.
