S
M
T
W
T
F
S
30
86°
49°
31
85°
56°
1
85°
54°
2
84°
54°
3
85°
50°
4
85°
47°
5
83°
46°
6
75°
45°
7
75°
46°
8
74°
53°
9
73°
46°
10
75°
51°
11
76°
44°
12
74°
50°
13
74°
53°
14
75°
50°
15
72°
46°
16
71°
45°
17
72°
48°
18
74°
51°
19
80°
47°
20
80°
46°
21
79°
44°
22
71°
41°
23
69°
43°
24
70°
49°
25
69°
40°
26
68°
43°
27
69°
43°
28
68°
45°
29
67°
40°
30
66°
41°
1
67°
47°
2
70°
49°
3
73°
46°
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 66° to 86°, with overnight lows between 40° and 56°. The average high for September is 75° with an average low of 47°. 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.
