S
M
T
W
T
F
S
30
95°
65°
31
96°
72°
1
97°
74°
2
96°
73°
3
97°
74°
4
96°
74°
5
95°
72°
6
97°
70°
7
97°
73°
8
96°
71°
9
97°
73°
10
95°
73°
11
91°
65°
12
90°
64°
13
91°
65°
14
87°
63°
15
83°
67°
16
84°
66°
17
87°
66°
18
89°
65°
19
88°
66°
20
87°
66°
21
84°
65°
22
88°
65°
23
88°
64°
24
87°
64°
25
88°
63°
26
87°
64°
27
88°
63°
28
88°
63°
29
87°
62°
30
88°
63°
1
87°
63°
2
86°
62°
3
85°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Riley
Riley's September 2026 forecast shows daily high temperatures ranging from 83° to 97°, with overnight lows between 62° and 74°. The average high for September is 90° with an average low of 67°. 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 Riley. See also: October | November | December.
