S
M
T
W
T
F
S
30
74°
54°
31
77°
55°
1
77°
55°
2
76°
54°
3
77°
48°
4
70°
45°
5
69°
49°
6
70°
54°
7
75°
54°
8
75°
53°
9
70°
52°
10
69°
53°
11
74°
52°
12
73°
53°
13
74°
53°
14
74°
52°
15
73°
53°
16
74°
52°
17
70°
51°
18
73°
45°
19
65°
43°
20
65°
42°
21
62°
41°
22
63°
45°
23
65°
44°
24
64°
41°
25
62°
41°
26
63°
45°
27
65°
46°
28
68°
47°
29
67°
48°
30
68°
47°
1
63°
46°
2
67°
45°
3
61°
45°
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 61° to 77°, with overnight lows between 41° and 55°. The average high for September is 69° with an average low of 49°. 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.
