S
M
T
W
T
F
S
30
92°
65°
31
90°
67°
1
88°
69°
2
90°
70°
3
90°
69°
4
89°
69°
5
90°
68°
6
89°
70°
7
91°
68°
8
89°
64°
9
87°
63°
10
86°
64°
11
88°
64°
12
89°
67°
13
89°
68°
14
87°
68°
15
Hist. Avg.
86°
66°
16
Hist. Avg.
86°
65°
17
Hist. Avg.
86°
65°
18
Hist. Avg.
86°
65°
19
Hist. Avg.
85°
64°
20
Hist. Avg.
85°
64°
21
Hist. Avg.
85°
64°
22
Hist. Avg.
84°
64°
23
Hist. Avg.
84°
63°
24
Hist. Avg.
84°
63°
25
Hist. Avg.
84°
62°
26
Hist. Avg.
83°
62°
27
Hist. Avg.
83°
62°
28
Hist. Avg.
82°
61°
29
Hist. Avg.
82°
61°
30
Hist. Avg.
82°
61°
1
Hist. Avg.
82°
60°
2
Hist. Avg.
81°
60°
3
Hist. Avg.
81°
59°
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 86° to 92°, with overnight lows between 63° and 70°. The average high for September is 89° with an average low of 67°. 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.
