S
M
T
W
T
F
S
30
84°
64°
31
85°
64°
1
87°
65°
2
86°
68°
3
87°
68°
4
87°
66°
5
86°
68°
6
83°
66°
7
83°
64°
8
87°
66°
9
87°
67°
10
86°
66°
11
86°
66°
12
85°
65°
13
85°
65°
14
84°
64°
15
86°
65°
16
86°
66°
17
Hist. Avg.
82°
62°
18
Hist. Avg.
82°
62°
19
Hist. Avg.
82°
62°
20
Hist. Avg.
82°
61°
21
Hist. Avg.
81°
61°
22
Hist. Avg.
81°
60°
23
Hist. Avg.
81°
60°
24
Hist. Avg.
80°
60°
25
Hist. Avg.
80°
59°
26
Hist. Avg.
80°
59°
27
Hist. Avg.
79°
58°
28
Hist. Avg.
79°
58°
29
Hist. Avg.
79°
58°
30
Hist. Avg.
78°
57°
1
Hist. Avg.
78°
57°
2
Hist. Avg.
78°
56°
3
Hist. Avg.
78°
56°
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 83° to 87°, with overnight lows between 64° and 68°. The average high for September is 86° with an average low of 66°. 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.
