S
M
T
W
T
F
S
30
66°
53°
31
76°
50°
1
73°
53°
2
75°
54°
3
78°
54°
4
81°
55°
5
81°
53°
6
82°
53°
7
74°
53°
8
76°
49°
9
75°
44°
10
77°
47°
11
77°
54°
12
77°
43°
13
82°
59°
14
70°
47°
15
75°
41°
16
69°
53°
17
68°
54°
18
71°
51°
19
65°
46°
20
54°
42°
21
67°
39°
22
72°
39°
23
N/A
24
67°
38°
25
62°
45°
26
72°
46°
27
73°
49°
28
57°
48°
29
64°
45°
30
67°
40°
1
70°
38°
2
73°
43°
3
70°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Rock River
Rock River's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Rock River. See also: October | November | December.
