S
M
T
W
T
F
S
30
84°
65°
31
78°
68°
1
94°
71°
2
94°
71°
3
95°
73°
4
96°
72°
5
93°
72°
6
82°
62°
7
80°
60°
8
85°
68°
9
85°
68°
10
78°
53°
11
80°
58°
12
83°
62°
13
84°
64°
14
83°
64°
15
79°
58°
16
76°
53°
17
78°
56°
18
78°
55°
19
75°
51°
20
72°
52°
21
77°
57°
22
71°
57°
23
72°
56°
24
79°
57°
25
80°
57°
26
79°
56°
27
79°
58°
28
78°
58°
29
79°
57°
30
79°
58°
1
78°
53°
2
76°
47°
3
64°
43°
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 64° to 85°, with overnight lows between 43° and 68°. The average high for September is 78° 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 Dayton. See also: October | November | December.
