S
M
T
W
T
F
S
30
78°
52°
31
76°
54°
1
77°
50°
2
76°
54°
3
79°
58°
4
85°
57°
5
84°
57°
6
85°
55°
7
81°
54°
8
75°
53°
9
75°
49°
10
76°
52°
11
75°
54°
12
79°
53°
13
74°
55°
14
74°
57°
15
81°
54°
16
81°
44°
17
73°
43°
18
71°
41°
19
69°
44°
20
71°
45°
21
71°
51°
22
78°
54°
23
77°
51°
24
78°
42°
25
70°
40°
26
68°
41°
27
67°
40°
28
68°
39°
29
67°
40°
30
69°
50°
1
65°
46°
2
70°
46°
3
Hist. Avg.
69°
41°
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 65° to 85°, with overnight lows between 39° and 58°. The average high for September is 75° with an average low of 49°. 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.
