S
M
T
W
T
F
S
30
84°
67°
31
88°
72°
1
93°
73°
2
93°
74°
3
94°
74°
4
94°
73°
5
83°
66°
6
79°
62°
7
81°
58°
8
85°
62°
9
90°
72°
10
82°
66°
11
81°
61°
12
80°
69°
13
88°
61°
14
73°
52°
15
88°
58°
16
91°
71°
17
87°
70°
18
78°
60°
19
87°
68°
20
80°
66°
21
80°
65°
22
79°
63°
23
78°
59°
24
73°
57°
25
73°
57°
26
76°
55°
27
78°
55°
28
79°
57°
29
80°
50°
30
78°
57°
1
76°
57°
2
72°
55°
3
70°
56°
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 70° to 91°, with overnight lows between 50° and 71°. The average high for September is 79° with an average low of 60°. 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.
