S
M
T
W
T
F
S
30
76°
59°
31
76°
59°
1
77°
61°
2
77°
64°
3
81°
64°
4
83°
63°
5
84°
63°
6
82°
62°
7
78°
61°
8
76°
59°
9
76°
61°
10
74°
61°
11
77°
60°
12
81°
61°
13
83°
61°
14
82°
60°
15
80°
60°
16
78°
59°
17
79°
59°
18
78°
58°
19
78°
59°
20
79°
59°
21
80°
56°
22
81°
56°
23
81°
45°
24
78°
43°
25
73°
47°
26
74°
51°
27
73°
56°
28
79°
57°
29
81°
54°
30
77°
44°
1
76°
42°
2
66°
51°
3
68°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cedar Rapids
Cedar Rapids's September 2026 forecast shows daily high temperatures ranging from 66° to 84°, with overnight lows between 42° and 64°. The average high for September is 78° with an average low of 57°. 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 Cedar Rapids. See also: October | November | December.
