S
M
T
W
T
F
S
30
81°
54°
31
77°
66°
1
86°
68°
2
72°
68°
3
90°
66°
4
84°
70°
5
81°
63°
6
79°
57°
7
79°
55°
8
N/A
9
85°
68°
10
83°
63°
11
79°
54°
12
77°
66°
13
76°
63°
14
80°
58°
15
79°
63°
16
76°
54°
17
74°
56°
18
73°
54°
19
69°
48°
20
71°
49°
21
70°
51°
22
69°
51°
23
69°
55°
24
70°
55°
25
67°
46°
26
67°
48°
27
73°
54°
28
75°
51°
29
69°
45°
30
71°
53°
1
71°
50°
2
67°
46°
3
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Coopersburg
Coopersburg's September 2026 forecast shows daily high temperatures ranging from 67° to 85°, with overnight lows between 45° and 68°. The average high for September is 73° with an average low of 54°. 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 Coopersburg. See also: October | November | December.
