S
M
T
W
T
F
S
30
82°
64°
31
83°
63°
1
85°
60°
2
77°
56°
3
76°
55°
4
76°
56°
5
79°
55°
6
82°
61°
7
84°
63°
8
84°
62°
9
83°
63°
10
85°
62°
11
83°
61°
12
84°
62°
13
85°
63°
14
82°
55°
15
72°
54°
16
72°
56°
17
75°
54°
18
83°
58°
19
83°
59°
20
82°
59°
21
78°
52°
22
75°
51°
23
72°
53°
24
68°
57°
25
68°
57°
26
74°
56°
27
78°
57°
28
79°
56°
29
78°
56°
30
77°
55°
1
77°
50°
2
76°
46°
3
66°
43°
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 66° to 85°, with overnight lows between 43° and 64°. The average high for September is 78° with an average low of 57°. 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.
