S
M
T
W
T
F
S
30
82°
47°
31
87°
51°
1
88°
52°
2
84°
48°
3
81°
48°
4
80°
45°
5
79°
48°
6
81°
45°
7
81°
42°
8
79°
45°
9
78°
48°
10
81°
51°
11
82°
47°
12
82°
51°
13
85°
52°
14
85°
51°
15
84°
51°
16
86°
49°
17
85°
48°
18
85°
49°
19
84°
49°
20
84°
50°
21
85°
49°
22
85°
51°
23
84°
50°
24
81°
48°
25
73°
47°
26
71°
45°
27
70°
46°
28
74°
45°
29
75°
46°
30
71°
45°
1
69°
46°
2
70°
44°
3
77°
45°
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 69° to 88°, with overnight lows between 42° and 52°. The average high for September is 80° 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.
