S
M
T
W
T
F
S
30
88°
65°
31
91°
65°
1
86°
63°
2
83°
65°
3
90°
70°
4
89°
68°
5
87°
68°
6
86°
59°
7
79°
62°
8
78°
60°
9
76°
56°
10
78°
54°
11
75°
51°
12
74°
52°
13
72°
53°
14
73°
50°
15
77°
55°
16
74°
52°
17
75°
56°
18
74°
55°
19
73°
52°
20
75°
54°
21
76°
55°
22
76°
55°
23
75°
54°
24
76°
55°
25
76°
54°
26
74°
54°
27
75°
53°
28
75°
53°
29
74°
52°
30
74°
53°
1
73°
54°
2
74°
52°
3
72°
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 72° to 90°, with overnight lows between 50° and 70°. The average high for September is 77° with an average low of 56°. 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.
