S
M
T
W
T
F
S
30
91°
68°
31
93°
68°
1
95°
69°
2
97°
70°
3
97°
72°
4
97°
73°
5
95°
72°
6
95°
72°
7
90°
70°
8
89°
66°
9
91°
66°
10
88°
69°
11
87°
69°
12
85°
68°
13
90°
67°
14
89°
68°
15
88°
66°
16
83°
64°
17
82°
62°
18
80°
58°
19
80°
57°
20
79°
59°
21
80°
58°
22
84°
62°
23
84°
63°
24
83°
62°
25
84°
62°
26
84°
61°
27
83°
62°
28
84°
62°
29
83°
61°
30
82°
61°
1
82°
60°
2
77°
55°
3
71°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Dayton
Dayton's September 2026 forecast shows daily high temperatures ranging from 71° to 91°, with overnight lows between 50° and 69°. The average high for September is 84° with an average low of 62°. 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 Dayton. See also: October | November | December.
