S
M
T
W
T
F
S
30
76°
53°
31
90°
51°
1
79°
55°
2
74°
52°
3
66°
49°
4
65°
46°
5
73°
48°
6
74°
52°
7
74°
51°
8
73°
51°
9
75°
52°
10
79°
50°
11
81°
53°
12
80°
52°
13
77°
52°
14
78°
48°
15
83°
54°
16
81°
50°
17
70°
44°
18
70°
44°
19
75°
48°
20
74°
50°
21
69°
43°
22
69°
46°
23
73°
46°
24
67°
44°
25
66°
43°
26
68°
45°
27
67°
49°
28
68°
48°
29
66°
43°
30
72°
46°
1
74°
49°
2
64°
48°
3
62°
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 62° to 83°, with overnight lows between 43° and 55°. The average high for September is 72° with an average low of 48°. 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.
