S
M
T
W
T
F
S
30
77°
58°
31
82°
62°
1
83°
61°
2
83°
62°
3
82°
54°
4
78°
51°
5
75°
53°
6
75°
58°
7
80°
59°
8
81°
59°
9
78°
57°
10
74°
58°
11
80°
57°
12
79°
59°
13
80°
59°
14
79°
58°
15
80°
58°
16
80°
57°
17
77°
57°
18
78°
50°
19
72°
49°
20
72°
47°
21
68°
46°
22
69°
50°
23
71°
49°
24
71°
46°
25
67°
46°
26
68°
47°
27
69°
46°
28
73°
52°
29
72°
51°
30
73°
51°
1
69°
52°
2
71°
48°
3
66°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Duncansville
Duncansville's September 2026 forecast shows daily high temperatures ranging from 66° to 83°, with overnight lows between 46° and 62°. The average high for September is 75° with an average low of 54°. 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 Duncansville. See also: October | November | December.
