S
M
T
W
T
F
S
30
77°
67°
31
87°
71°
1
91°
69°
2
89°
71°
3
91°
74°
4
93°
71°
5
88°
64°
6
82°
62°
7
83°
65°
8
89°
67°
9
84°
63°
10
77°
60°
11
78°
61°
12
79°
63°
13
83°
66°
14
77°
61°
15
78°
60°
16
81°
61°
17
75°
54°
18
72°
56°
19
75°
59°
20
78°
59°
21
75°
58°
22
77°
57°
23
74°
57°
24
75°
56°
25
75°
56°
26
70°
49°
27
65°
45°
28
63°
44°
29
64°
46°
30
63°
43°
1
61°
50°
2
64°
51°
3
62°
48°
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 61° to 93°, with overnight lows between 43° and 71°. The average high for September is 75° 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 Dubuque. See also: October | November | December.
