S
M
T
W
T
F
S
30
84°
67°
31
88°
72°
1
93°
73°
2
96°
73°
3
96°
73°
4
92°
71°
5
81°
65°
6
83°
65°
7
83°
63°
8
85°
65°
9
90°
69°
10
89°
64°
11
80°
64°
12
82°
62°
13
81°
63°
14
77°
58°
15
79°
56°
16
83°
62°
17
82°
61°
18
78°
61°
19
82°
61°
20
80°
60°
21
79°
60°
22
79°
58°
23
77°
54°
24
73°
57°
25
80°
58°
26
77°
53°
27
69°
48°
28
68°
46°
29
67°
47°
30
68°
46°
1
66°
45°
2
67°
52°
3
72°
54°
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 96°, with overnight lows between 45° and 73°. The average high for September is 79° with an average low of 59°. 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.
