S
M
T
W
T
F
S
30
85°
61°
31
77°
56°
1
77°
55°
2
76°
55°
3
77°
58°
4
84°
63°
5
82°
64°
6
78°
64°
7
82°
60°
8
82°
61°
9
81°
62°
10
82°
61°
11
85°
62°
12
82°
61°
13
83°
61°
14
84°
52°
15
83°
49°
16
73°
49°
17
72°
50°
18
73°
56°
19
75°
58°
20
74°
59°
21
72°
57°
22
74°
51°
23
79°
54°
24
80°
57°
25
81°
57°
26
81°
58°
27
80°
53°
28
79°
45°
29
71°
49°
30
68°
51°
1
66°
49°
2
67°
53°
3
65°
48°
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 85°, with overnight lows between 45° and 64°. 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.
