S
M
T
W
T
F
S
30
76°
43°
31
84°
49°
1
72°
58°
2
65°
52°
3
66°
50°
4
71°
52°
5
72°
50°
6
77°
51°
7
73°
51°
8
73°
51°
9
77°
54°
10
79°
52°
11
79°
51°
12
77°
51°
13
75°
50°
14
78°
49°
15
73°
51°
16
71°
50°
17
71°
46°
18
72°
45°
19
70°
51°
20
69°
48°
21
69°
43°
22
70°
44°
23
68°
43°
24
67°
43°
25
67°
45°
26
68°
43°
27
71°
51°
28
66°
50°
29
68°
46°
30
69°
49°
1
66°
47°
2
65°
41°
3
65°
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 65° to 79°, with overnight lows between 41° and 58°. The average high for September is 71° with an average low of 49°. 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.
