Average data for 10 years
1 September
Sunday
+26°
+21°
2 September
Monday
+26°
+21°
3 September
Tuesday
+26°
+21°
4 September
Wednesday
+27°
+20°
5 September
Thursday
+25°
+20°
6 September
Friday
+25°
+19°
7 September
Saturday
+26°
+21°
8 September
Sunday
+25°
+20°
9 September
Monday
+24°
+20°
10 September
Tuesday
+24°
+19°
11 September
Wednesday
+23°
+19°
12 September
Thursday
+23°
+18°
13 September
Friday
+24°
+17°
14 September
Saturday
+25°
+18°
15 September
Sunday
+23°
+19°
16 September
Monday
+21°
+17°
17 September
Tuesday
+22°
+15°
18 September
Wednesday
+23°
+17°
19 September
Thursday
+22°
+18°
20 September
Friday
+23°
+16°
21 September
Saturday
+23°
+19°
22 September
Sunday
+24°
+18°
23 September
Monday
+24°
+18°
24 September
Tuesday
+22°
+19°
25 September
Wednesday
+21°
+16°
26 September
Thursday
+23°
+17°
27 September
Friday
+23°
+19°
28 September
Saturday
+22°
+18°
29 September
Sunday
+20°
+17°
30 September
Monday
+19°
+15°
In September, the weather in Philadelphia is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, Philadelphia has 14 sunny, 8 rainy, 7 partly cloudy, and 1 cloudy day in September. The rains are usually heavy. September as well as August is considered the most comfortable time to visit Philadelphia.