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°
61°
11
81°
65°
12
86°
64°
13
76°
60°
14
77°
71°
15
85°
61°
16
71°
62°
17
75°
59°
18
73°
57°
19
71°
52°
20
71°
54°
21
69°
52°
22
72°
52°
23
74°
52°
24
77°
57°
25
71°
57°
26
77°
58°
27
77°
58°
28
76°
57°
29
76°
58°
30
75°
55°
1
73°
53°
2
69°
55°
3
74°
55°
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 69° to 86°, with overnight lows between 52° and 71°. The average high for September is 75° with an average low of 58°. 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.
