S
M
T
W
T
F
S
30
80°
65°
31
80°
64°
1
84°
65°
2
85°
64°
3
84°
56°
4
77°
61°
5
76°
64°
6
84°
60°
7
80°
56°
8
75°
56°
9
74°
62°
10
75°
63°
11
80°
62°
12
82°
62°
13
82°
61°
14
81°
54°
15
78°
54°
16
71°
57°
17
72°
52°
18
72°
51°
19
73°
48°
20
70°
49°
21
69°
52°
22
70°
57°
23
74°
51°
24
76°
57°
25
77°
58°
26
76°
58°
27
77°
57°
28
76°
53°
29
75°
52°
30
68°
53°
1
72°
52°
2
76°
54°
3
67°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bettendorf
Bettendorf's September 2026 forecast shows daily high temperatures ranging from 67° to 85°, with overnight lows between 45° and 65°. The average high for September is 76° 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 Bettendorf. See also: October | November | December.
