S
M
T
W
T
F
S
30
88°
62°
31
87°
62°
1
81°
60°
2
83°
57°
3
86°
57°
4
87°
62°
5
88°
62°
6
87°
59°
7
82°
55°
8
80°
54°
9
80°
54°
10
84°
55°
11
84°
55°
12
83°
56°
13
79°
57°
14
83°
59°
15
82°
58°
16
84°
56°
17
79°
51°
18
76°
51°
19
74°
52°
20
75°
56°
21
75°
50°
22
74°
53°
23
75°
55°
24
73°
56°
25
76°
56°
26
80°
55°
27
79°
54°
28
79°
54°
29
78°
53°
30
73°
54°
1
72°
53°
2
73°
47°
3
71°
45°
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 71° to 88°, with overnight lows between 45° and 62°. The average high for September is 80° with an average low of 55°. 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.
