S
M
T
W
T
F
S
30
89°
64°
31
82°
62°
1
81°
64°
2
81°
67°
3
82°
63°
4
84°
70°
5
87°
69°
6
88°
62°
7
85°
64°
8
80°
61°
9
80°
60°
10
79°
67°
11
83°
60°
12
81°
61°
13
78°
60°
14
77°
66°
15
81°
67°
16
84°
58°
17
84°
57°
18
75°
56°
19
74°
58°
20
75°
61°
21
74°
59°
22
74°
57°
23
72°
62°
24
73°
61°
25
74°
62°
26
79°
62°
27
79°
56°
28
78°
54°
29
72°
57°
30
71°
60°
1
72°
61°
2
75°
58°
3
76°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Wissahickon
Wissahickon's September 2026 forecast shows daily high temperatures ranging from 71° to 89°, with overnight lows between 53° and 70°. The average high for September is 79° with an average low of 61°. 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 Wissahickon. See also: October | November | December.
