S
M
T
W
T
F
S
30
85°
65°
31
82°
67°
1
88°
71°
2
92°
71°
3
88°
66°
4
81°
67°
5
79°
64°
6
77°
58°
7
81°
60°
8
86°
68°
9
90°
72°
10
77°
60°
11
78°
58°
12
84°
63°
13
85°
63°
14
80°
63°
15
79°
60°
16
77°
58°
17
80°
60°
18
79°
60°
19
74°
57°
20
73°
54°
21
79°
59°
22
75°
58°
23
74°
57°
24
78°
57°
25
78°
58°
26
79°
58°
27
77°
57°
28
78°
58°
29
78°
58°
30
79°
57°
1
78°
57°
2
76°
52°
3
74°
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 73° to 90°, with overnight lows between 46° and 72°. The average high for September is 79° with an average low of 59°. 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.
