S
M
T
W
T
F
S
30
90°
66°
31
94°
69°
1
95°
68°
2
96°
70°
3
97°
71°
4
97°
72°
5
93°
68°
6
83°
61°
7
85°
60°
8
88°
64°
9
92°
71°
10
82°
68°
11
83°
66°
12
84°
69°
13
89°
57°
14
77°
57°
15
94°
69°
16
95°
70°
17
90°
68°
18
84°
65°
19
83°
66°
20
77°
61°
21
78°
60°
22
73°
58°
23
73°
55°
24
75°
56°
25
78°
57°
26
79°
52°
27
80°
58°
28
79°
58°
29
78°
57°
30
79°
58°
1
78°
57°
2
78°
56°
3
77°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Downtown Cincinnati
Downtown Cincinnati's September 2026 forecast shows daily high temperatures ranging from 73° to 95°, with overnight lows between 52° and 70°. The average high for September is 81° with an average low of 60°. 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 Downtown Cincinnati. See also: October | November | December.
