S
M
T
W
T
F
S
30
78°
53°
31
77°
52°
1
77°
53°
2
78°
54°
3
76°
55°
4
75°
53°
5
78°
54°
6
77°
53°
7
75°
51°
8
76°
50°
9
74°
51°
10
75°
55°
11
74°
50°
12
73°
50°
13
76°
49°
14
76°
55°
15
77°
55°
16
76°
53°
17
73°
48°
18
72°
47°
19
72°
48°
20
76°
53°
21
72°
47°
22
71°
50°
23
74°
52°
24
75°
53°
25
76°
51°
26
75°
44°
27
73°
45°
28
67°
44°
29
66°
43°
30
67°
43°
1
66°
43°
2
Hist. Avg.
68°
44°
3
Hist. Avg.
68°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Pen Argyl
Pen Argyl's September 2026 forecast shows daily high temperatures ranging from 66° to 78°, with overnight lows between 43° and 55°. The average high for September is 74° with an average low of 50°. 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 Pen Argyl. See also: October | November | December.
