S
M
T
W
T
F
S
30
77°
67°
31
87°
71°
1
91°
69°
2
89°
71°
3
91°
74°
4
91°
73°
5
83°
70°
6
81°
63°
7
79°
61°
8
86°
64°
9
81°
63°
10
78°
58°
11
78°
56°
12
80°
59°
13
64°
49°
14
67°
48°
15
71°
61°
16
67°
59°
17
68°
63°
18
71°
62°
19
69°
60°
20
66°
57°
21
59°
52°
22
62°
50°
23
68°
47°
24
68°
54°
25
67°
55°
26
68°
50°
27
73°
57°
28
75°
59°
29
76°
51°
30
66°
62°
1
66°
51°
2
67°
43°
3
69°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Dubuque
Dubuque's September 2026 forecast shows daily high temperatures ranging from 67° to 69°, with overnight lows between 43° and 49°. The average high for September is 68° with an average low of 46°. 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 Dubuque. See also: October | November | December.
