S
M
T
W
T
F
S
30
86°
56°
31
78°
60°
1
79°
64°
2
78°
59°
3
82°
57°
4
83°
63°
5
86°
61°
6
86°
54°
7
77°
54°
8
76°
52°
9
76°
55°
10
82°
59°
11
81°
54°
12
76°
53°
13
75°
51°
14
77°
59°
15
81°
58°
16
82°
51°
17
75°
49°
18
72°
49°
19
72°
50°
20
73°
54°
21
70°
55°
22
71°
51°
23
71°
55°
24
72°
49°
25
73°
57°
26
77°
57°
27
77°
48°
28
75°
49°
29
69°
55°
30
73°
56°
1
68°
55°
2
70°
52°
3
67°
46°
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 67° to 86°, with overnight lows between 46° and 64°. The average high for September is 76° with an average low of 54°. 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.
