S
M
T
W
T
F
S
30
85°
66°
31
86°
65°
1
87°
64°
2
84°
61°
3
81°
60°
4
83°
62°
5
86°
61°
6
86°
64°
7
87°
64°
8
87°
63°
9
86°
65°
10
87°
63°
11
85°
63°
12
87°
64°
13
86°
64°
14
84°
53°
15
74°
55°
16
76°
59°
17
77°
56°
18
75°
53°
19
73°
50°
20
74°
51°
21
79°
52°
22
81°
54°
23
81°
50°
24
75°
49°
25
72°
55°
26
78°
56°
27
77°
56°
28
79°
51°
29
71°
46°
30
70°
46°
1
71°
49°
2
78°
49°
3
78°
53°
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 70° to 87°, with overnight lows between 46° and 66°. The average high for September is 80° 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.
