S
M
T
W
T
F
S
30
90°
69°
31
90°
63°
1
86°
63°
2
88°
64°
3
91°
70°
4
97°
63°
5
90°
68°
6
77°
64°
7
82°
64°
8
84°
59°
9
81°
54°
10
81°
50°
11
86°
61°
12
72°
50°
13
70°
48°
14
64°
54°
15
72°
52°
16
71°
61°
17
73°
63°
18
78°
59°
19
67°
58°
20
64°
54°
21
66°
51°
22
69°
53°
23
70°
51°
24
71°
53°
25
74°
52°
26
73°
52°
27
76°
54°
28
70°
51°
29
71°
44°
30
67°
46°
1
72°
50°
2
63°
49°
3
62°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rock Rapids
Rock Rapids's September 2026 forecast shows daily high temperatures ranging from 62° to 78°, with overnight lows between 44° and 63°. The average high for September is 70° with an average low of 53°. 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 Rapids. See also: October | November | December.
