S
M
T
W
T
F
S
30
90°
66°
31
92°
69°
1
92°
68°
2
88°
69°
3
90°
68°
4
91°
67°
5
91°
68°
6
90°
68°
7
92°
67°
8
90°
67°
9
91°
66°
10
90°
67°
11
90°
66°
12
89°
66°
13
90°
63°
14
87°
61°
15
85°
61°
16
85°
62°
17
87°
64°
18
89°
64°
19
88°
63°
20
87°
64°
21
83°
63°
22
88°
64°
23
88°
63°
24
87°
58°
25
82°
58°
26
86°
61°
27
87°
61°
28
87°
61°
29
Hist. Avg.
86°
61°
30
Hist. Avg.
85°
61°
1
Hist. Avg.
85°
60°
2
Hist. Avg.
85°
60°
3
Hist. Avg.
84°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Philadelphia
Philadelphia's September 2026 forecast shows daily high temperatures ranging from 82° to 92°, with overnight lows between 58° and 69°. The average high for September is 88° 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.
