S
M
T
W
T
F
S
30
83°
56°
31
81°
66°
1
90°
72°
2
77°
69°
3
88°
71°
4
85°
63°
5
82°
60°
6
79°
58°
7
80°
60°
8
83°
62°
9
85°
65°
10
89°
63°
11
83°
62°
12
81°
61°
13
81°
62°
14
82°
61°
15
79°
58°
16
77°
62°
17
78°
54°
18
75°
53°
19
82°
57°
20
82°
58°
21
81°
56°
22
80°
58°
23
74°
59°
24
79°
55°
25
77°
54°
26
79°
58°
27
79°
57°
28
78°
52°
29
70°
48°
30
72°
51°
1
70°
47°
2
69°
51°
3
67°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in King of Prussia
King of Prussia's September 2026 forecast shows daily high temperatures ranging from 67° to 89°, with overnight lows between 47° and 71°. The average high for September is 79° with an average low of 58°. 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 King of Prussia. See also: October | November | December.
