S
M
T
W
T
F
S
30
84°
62°
31
85°
63°
1
85°
63°
2
84°
62°
3
85°
55°
4
77°
53°
5
77°
56°
6
79°
62°
7
83°
62°
8
84°
61°
9
77°
56°
10
76°
60°
11
83°
61°
12
82°
61°
13
82°
60°
14
81°
60°
15
82°
59°
16
81°
59°
17
76°
57°
18
81°
51°
19
72°
50°
20
73°
48°
21
70°
48°
22
71°
52°
23
72°
51°
24
72°
48°
25
70°
48°
26
70°
55°
27
72°
54°
28
76°
55°
29
75°
54°
30
76°
54°
1
70°
52°
2
74°
52°
3
68°
51°
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 85°, with overnight lows between 48° 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.
