S
M
T
W
T
F
S
30
77°
52°
31
79°
56°
1
75°
55°
2
77°
58°
3
76°
51°
4
76°
49°
5
74°
49°
6
72°
51°
7
73°
51°
8
78°
48°
9
77°
48°
10
80°
46°
11
74°
46°
12
75°
48°
13
74°
47°
14
77°
50°
15
80°
52°
16
79°
54°
17
80°
53°
18
79°
52°
19
79°
50°
20
Hist. Avg.
72°
47°
21
Hist. Avg.
72°
46°
22
Hist. Avg.
71°
46°
23
Hist. Avg.
71°
45°
24
Hist. Avg.
70°
45°
25
Hist. Avg.
70°
44°
26
Hist. Avg.
70°
44°
27
Hist. Avg.
69°
44°
28
Hist. Avg.
69°
43°
29
Hist. Avg.
68°
43°
30
Hist. Avg.
68°
42°
1
Hist. Avg.
68°
42°
2
Hist. Avg.
67°
42°
3
Hist. Avg.
67°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Rock Valley
Rock Valley's September 2026 forecast shows daily high temperatures ranging from 72° to 80°, with overnight lows between 46° and 58°. The average high for September is 77° with an average low of 51°. 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 Valley. See also: October | November | December.
