S
M
T
W
T
F
S
30
87°
64°
31
82°
72°
1
93°
74°
2
75°
73°
3
92°
75°
4
87°
68°
5
83°
65°
6
80°
63°
7
82°
64°
8
83°
68°
9
85°
73°
10
90°
69°
11
84°
64°
12
82°
66°
13
81°
68°
14
82°
66°
15
79°
63°
16
78°
67°
17
79°
60°
18
75°
58°
19
82°
62°
20
83°
64°
21
82°
61°
22
80°
64°
23
74°
64°
24
80°
61°
25
77°
60°
26
80°
64°
27
79°
63°
28
79°
58°
29
70°
54°
30
72°
57°
1
71°
53°
2
69°
57°
3
68°
54°
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 68° to 92°, with overnight lows between 53° and 75°. The average high for September is 79° with an average low of 63°. 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.
