S
M
T
W
T
F
S
30
68°
42°
31
67°
43°
1
67°
44°
2
68°
44°
3
71°
39°
4
70°
43°
5
68°
45°
6
66°
44°
7
65°
39°
8
70°
42°
9
72°
39°
10
72°
40°
11
71°
46°
12
71°
41°
13
64°
36°
14
64°
46°
15
69°
47°
16
71°
44°
17
70°
38°
18
61°
36°
19
58°
34°
20
57°
35°
21
57°
37°
22
59°
36°
23
59°
35°
24
57°
34°
25
58°
34°
26
57°
33°
27
58°
36°
28
56°
35°
29
53°
33°
30
54°
30°
1
Hist. Avg.
59°
35°
2
Hist. Avg.
58°
34°
3
Hist. Avg.
58°
34°
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 53° to 72°, with overnight lows between 30° and 47°. The average high for September is 64° with an average low of 39°. 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.
