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
91°
68°
14
77°
57°
15
93°
57°
16
95°
71°
17
91°
71°
18
83°
63°
19
88°
68°
20
85°
68°
21
84°
66°
22
81°
65°
23
78°
62°
24
75°
59°
25
75°
57°
26
80°
56°
27
80°
57°
28
81°
58°
29
82°
51°
30
79°
58°
1
78°
57°
2
73°
56°
3
72°
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 72° to 95°, with overnight lows between 51° and 71°. The average high for September is 81° with an average low of 61°. 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.
