S
M
T
W
T
F
S
30
82°
61°
31
81°
63°
1
79°
58°
2
79°
60°
3
76°
62°
4
76°
63°
5
76°
57°
6
75°
54°
7
75°
53°
8
76°
55°
9
77°
54°
10
73°
52°
11
73°
60°
12
74°
58°
13
77°
53°
14
80°
57°
15
81°
59°
16
80°
61°
17
81°
60°
18
81°
60°
19
80°
59°
20
80°
60°
21
79°
60°
22
77°
59°
23
77°
58°
24
78°
59°
25
79°
58°
26
79°
58°
27
78°
49°
28
67°
46°
29
66°
49°
30
76°
54°
1
75°
50°
2
71°
44°
3
65°
40°
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 65° to 82°, with overnight lows between 40° and 63°. The average high for September is 77° 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 Pittsburgh. See also: October | November | December.
