S
M
T
W
T
F
S
30
81°
61°
31
77°
58°
1
77°
58°
2
79°
60°
3
76°
62°
4
75°
58°
5
76°
55°
6
76°
54°
7
78°
59°
8
80°
59°
9
81°
58°
10
82°
62°
11
81°
61°
12
82°
61°
13
83°
62°
14
80°
60°
15
72°
57°
16
72°
55°
17
74°
53°
18
75°
52°
19
77°
55°
20
77°
53°
21
72°
51°
22
75°
52°
23
78°
51°
24
78°
54°
25
79°
57°
26
80°
56°
27
78°
57°
28
78°
58°
29
77°
55°
30
74°
51°
1
67°
48°
2
65°
47°
3
66°
41°
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 83°, with overnight lows between 41° and 62°. 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.
