S
M
T
W
T
F
S
30
83°
64°
31
84°
63°
1
85°
64°
2
85°
61°
3
83°
58°
4
77°
58°
5
80°
61°
6
77°
59°
7
76°
53°
8
81°
58°
9
84°
62°
10
83°
61°
11
83°
52°
12
80°
59°
13
82°
61°
14
83°
60°
15
77°
59°
16
82°
59°
17
82°
61°
18
83°
61°
19
82°
60°
20
80°
51°
21
79°
48°
22
71°
54°
23
74°
55°
24
79°
58°
25
80°
57°
26
80°
48°
27
75°
47°
28
68°
48°
29
69°
49°
30
66°
46°
1
66°
51°
2
70°
56°
3
74°
54°
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 46° and 64°. The average high for September is 78° 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.
