S
M
T
W
T
F
S
30
86°
61°
31
89°
69°
1
82°
70°
2
92°
69°
3
93°
71°
4
84°
68°
5
83°
68°
6
80°
58°
7
82°
60°
8
86°
59°
9
89°
68°
10
79°
72°
11
81°
65°
12
78°
65°
13
85°
65°
14
72°
53°
15
84°
49°
16
88°
70°
17
84°
68°
18
76°
55°
19
82°
66°
20
76°
64°
21
77°
64°
22
77°
62°
23
76°
60°
24
75°
55°
25
71°
54°
26
76°
52°
27
76°
52°
28
75°
54°
29
76°
41°
30
77°
56°
1
76°
56°
2
71°
55°
3
67°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Duncan Falls
Duncan Falls's September 2026 forecast shows daily high temperatures ranging from 67° to 88°, with overnight lows between 41° and 70°. The average high for September is 76° with an average low of 58°. 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 Falls. See also: October | November | December.
