S
M
T
W
T
F
S
30
88°
64°
31
86°
58°
1
82°
57°
2
80°
58°
3
80°
58°
4
81°
57°
5
80°
57°
6
78°
58°
7
79°
56°
8
79°
59°
9
80°
56°
10
77°
56°
11
78°
57°
12
79°
55°
13
78°
56°
14
77°
55°
15
76°
57°
16
77°
53°
17
76°
54°
18
75°
54°
19
76°
59°
20
75°
58°
21
80°
57°
22
Hist. Avg.
72°
53°
23
Hist. Avg.
72°
52°
24
Hist. Avg.
72°
52°
25
Hist. Avg.
71°
52°
26
Hist. Avg.
71°
51°
27
Hist. Avg.
70°
51°
28
Hist. Avg.
70°
50°
29
Hist. Avg.
70°
50°
30
Hist. Avg.
69°
50°
1
Hist. Avg.
69°
49°
2
Hist. Avg.
68°
49°
3
Hist. Avg.
68°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Valley Forge
Valley Forge's September 2026 forecast shows daily high temperatures ranging from 75° to 88°, with overnight lows between 53° and 64°. The average high for September is 79° with an average low of 57°. 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 Valley Forge. See also: October | November | December.
