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
78°
58°
8
82°
59°
9
85°
67°
10
79°
68°
11
80°
64°
12
84°
63°
13
82°
68°
14
70°
56°
15
80°
52°
16
85°
62°
17
83°
68°
18
80°
60°
19
77°
68°
20
75°
58°
21
69°
61°
22
70°
59°
23
72°
60°
24
73°
57°
25
74°
53°
26
71°
52°
27
76°
57°
28
74°
58°
29
73°
56°
30
74°
50°
1
76°
57°
2
72°
56°
3
67°
56°
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 83°, with overnight lows between 50° and 68°. The average high for September is 74° with an average low of 58°. 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.
