S
M
T
W
T
F
S
30
76°
56°
31
77°
62°
1
81°
63°
2
75°
63°
3
84°
64°
4
84°
60°
5
83°
59°
6
78°
53°
7
75°
55°
8
80°
60°
9
81°
58°
10
81°
59°
11
78°
53°
12
76°
59°
13
78°
59°
14
81°
52°
15
73°
57°
16
71°
58°
17
70°
57°
18
71°
54°
19
77°
49°
20
71°
56°
21
74°
49°
22
74°
53°
23
73°
49°
24
77°
50°
25
76°
56°
26
76°
55°
27
75°
57°
28
75°
55°
29
74°
47°
30
67°
52°
1
73°
55°
2
75°
51°
3
73°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Allegheny Township
Allegheny Township's September 2026 forecast shows daily high temperatures ranging from 67° to 84°, with overnight lows between 47° and 64°. The average high for September is 76° with an average low of 56°. 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 Allegheny Township. See also: October | November | December.
