S
M
T
W
T
F
S
30
69°
51°
31
70°
53°
1
71°
58°
2
74°
60°
3
71°
62°
4
79°
60°
5
81°
56°
6
75°
53°
7
70°
49°
8
70°
53°
9
73°
50°
10
74°
54°
11
73°
53°
12
69°
55°
13
72°
57°
14
77°
56°
15
74°
53°
16
67°
54°
17
66°
55°
18
68°
52°
19
72°
50°
20
66°
53°
21
70°
44°
22
66°
43°
23
64°
43°
24
63°
44°
25
65°
44°
26
64°
43°
27
62°
48°
28
62°
45°
29
61°
41°
30
60°
48°
1
62°
43°
2
68°
41°
3
60°
39°
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 60° to 81°, with overnight lows between 39° and 62°. The average high for September is 69° with an average low of 50°. 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.
