S
M
T
W
T
F
S
30
77°
56°
31
78°
61°
1
81°
63°
2
76°
64°
3
85°
64°
4
85°
62°
5
82°
57°
6
80°
54°
7
76°
57°
8
83°
60°
9
82°
58°
10
80°
60°
11
77°
53°
12
76°
55°
13
77°
59°
14
82°
52°
15
74°
56°
16
72°
58°
17
71°
55°
18
72°
54°
19
76°
49°
20
72°
53°
21
75°
50°
22
75°
54°
23
76°
49°
24
78°
49°
25
77°
56°
26
77°
55°
27
75°
57°
28
76°
55°
29
76°
48°
30
69°
52°
1
74°
56°
2
75°
52°
3
74°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Pittsburgh
Pittsburgh's September 2026 forecast shows daily high temperatures ranging from 69° to 85°, with overnight lows between 48° and 64°. The average high for September is 77° with an average low of 55°. 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 Pittsburgh. See also: October | November | December.
