S
M
T
W
T
F
S
30
101°
76°
31
101°
79°
1
100°
77°
2
100°
78°
3
92°
76°
4
99°
76°
5
100°
77°
6
100°
77°
7
101°
77°
8
101°
80°
9
100°
80°
10
99°
76°
11
99°
76°
12
101°
74°
13
98°
76°
14
99°
77°
15
98°
78°
16
97°
76°
17
96°
74°
18
98°
76°
19
97°
75°
20
91°
69°
21
89°
68°
22
88°
67°
23
89°
70°
24
91°
69°
25
90°
70°
26
86°
65°
27
89°
70°
28
87°
70°
29
87°
70°
30
89°
69°
1
88°
69°
2
87°
68°
3
87°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Duncanville
Duncanville's September 2026 forecast shows daily high temperatures ranging from 86° to 99°, with overnight lows between 65° and 78°. The average high for September is 91° with an average low of 71°. 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 Duncanville. See also: October | November | December.
