S
M
T
W
T
F
S
30
90°
64°
31
90°
64°
1
94°
68°
2
98°
66°
3
91°
66°
4
96°
66°
5
82°
64°
6
78°
60°
7
80°
56°
8
85°
55°
9
90°
56°
10
88°
67°
11
76°
69°
12
81°
68°
13
87°
66°
14
81°
60°
15
80°
49°
16
91°
54°
17
93°
61°
18
82°
65°
19
81°
65°
20
81°
66°
21
68°
62°
22
63°
55°
23
N/A
24
62°
44°
25
71°
47°
26
74°
48°
27
71°
51°
28
71°
54°
29
74°
51°
30
77°
58°
1
79°
57°
2
77°
52°
3
73°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Dayton
Dayton's September 2026 forecast shows daily high temperatures ranging from 62° to 79°, with overnight lows between 44° and 58°. The average high for September is 73° with an average low of 52°. 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.
