S
M
T
W
T
F
S
30
72°
53°
31
73°
52°
1
70°
48°
2
62°
47°
3
60°
44°
4
63°
51°
5
71°
51°
6
71°
50°
7
70°
48°
8
62°
44°
9
59°
41°
10
62°
43°
11
56°
42°
12
62°
45°
13
57°
43°
14
61°
38°
15
55°
37°
16
54°
36°
17
54°
32°
18
55°
37°
19
55°
35°
20
53°
40°
21
62°
45°
22
65°
44°
23
63°
39°
24
63°
47°
25
66°
44°
26
64°
38°
27
63°
30°
28
54°
38°
29
50°
34°
30
50°
42°
1
56°
31°
2
58°
30°
3
48°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in River Heights
River Heights's September 2026 forecast shows daily high temperatures ranging from 48° to 73°, with overnight lows between 29° and 53°. The average high for September is 61° with an average low of 41°. 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 River Heights. See also: October | November | December.
