S
M
T
W
T
F
S
30
102°
76°
31
100°
75°
1
101°
75°
2
102°
75°
3
99°
73°
4
102°
73°
5
100°
75°
6
102°
75°
7
102°
73°
8
102°
77°
9
102°
79°
10
88°
72°
11
100°
70°
12
106°
73°
13
102°
77°
14
100°
77°
15
102°
77°
16
100°
77°
17
100°
75°
18
99°
73°
19
99°
72°
20
95°
73°
21
91°
68°
22
90°
70°
23
95°
68°
24
93°
73°
25
N/A
26
97°
72°
27
95°
68°
28
93°
68°
29
93°
75°
30
88°
70°
1
77°
68°
2
79°
66°
3
70°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Duncan
Duncan's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Duncan. See also: October | November | December.
