S
M
T
W
T
F
S
30
87°
64°
31
82°
72°
1
92°
74°
2
80°
73°
3
90°
74°
4
87°
70°
5
82°
66°
6
79°
62°
7
80°
65°
8
81°
66°
9
77°
63°
10
80°
67°
11
80°
64°
12
82°
63°
13
81°
63°
14
80°
64°
15
78°
66°
16
78°
67°
17
79°
60°
18
75°
58°
19
75°
58°
20
76°
61°
21
79°
65°
22
82°
66°
23
83°
66°
24
83°
64°
25
80°
61°
26
80°
63°
27
81°
64°
28
80°
63°
29
81°
62°
30
74°
58°
1
70°
55°
2
73°
59°
3
77°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Philadelphia
Philadelphia's September 2026 forecast shows daily high temperatures ranging from 70° to 92°, with overnight lows between 55° and 74°. The average high for September is 80° with an average low of 64°. 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 Philadelphia. See also: October | November | December.
