S
M
T
W
T
F
S
30
77°
56°
31
77°
60°
1
78°
64°
2
77°
64°
3
80°
63°
4
84°
64°
5
83°
63°
6
84°
64°
7
80°
63°
8
77°
62°
9
77°
59°
10
78°
62°
11
78°
62°
12
76°
61°
13
75°
59°
14
77°
56°
15
78°
59°
16
78°
60°
17
77°
60°
18
79°
59°
19
77°
60°
20
80°
59°
21
81°
58°
22
80°
50°
23
78°
50°
24
73°
54°
25
74°
57°
26
68°
56°
27
75°
57°
28
75°
56°
29
79°
57°
30
80°
58°
1
79°
55°
2
79°
56°
3
77°
55°
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 68° to 84°, with overnight lows between 50° and 64°. The average high for September is 78° with an average low of 59°. 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.
