S
M
T
W
T
F
S
30
77°
46°
31
81°
41°
1
82°
53°
2
88°
55°
3
87°
57°
4
93°
53°
5
87°
56°
6
80°
53°
7
77°
47°
8
77°
46°
9
76°
47°
10
79°
47°
11
81°
46°
12
80°
46°
13
77°
44°
14
74°
41°
15
78°
48°
16
79°
47°
17
79°
46°
18
71°
43°
19
75°
46°
20
77°
46°
21
76°
45°
22
74°
46°
23
77°
46°
24
77°
45°
25
74°
45°
26
74°
46°
27
74°
45°
28
74°
45°
29
73°
44°
30
73°
45°
1
72°
44°
2
72°
44°
3
71°
42°
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 93°, with overnight lows between 41° and 57°. The average high for September is 78° 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.
