S
M
T
W
T
F
S
30
81°
61°
31
82°
64°
1
85°
64°
2
85°
63°
3
84°
63°
4
85°
62°
5
84°
61°
6
84°
62°
7
83°
63°
8
85°
63°
9
85°
61°
10
83°
62°
11
84°
63°
12
83°
62°
13
82°
62°
14
77°
61°
15
80°
61°
16
81°
58°
17
79°
58°
18
73°
55°
19
71°
51°
20
76°
56°
21
80°
53°
22
70°
48°
23
68°
47°
24
74°
53°
25
71°
51°
26
78°
56°
27
78°
54°
28
72°
59°
29
77°
55°
30
75°
45°
1
70°
42°
2
64°
41°
3
64°
45°
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 64° to 85°, with overnight lows between 41° and 64°. The average high for September is 78° with an average low of 57°. 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.
