S
M
T
W
T
F
S
30
83°
58°
31
84°
64°
1
84°
64°
2
78°
59°
3
77°
55°
4
76°
55°
5
76°
54°
6
77°
55°
7
81°
61°
8
83°
58°
9
80°
53°
10
79°
59°
11
75°
49°
12
73°
53°
13
72°
52°
14
73°
51°
15
72°
53°
16
73°
50°
17
72°
52°
18
73°
50°
19
72°
48°
20
71°
47°
21
70°
48°
22
71°
47°
23
74°
50°
24
76°
54°
25
79°
57°
26
78°
56°
27
70°
56°
28
70°
55°
29
71°
46°
30
70°
46°
1
68°
54°
2
76°
45°
3
76°
44°
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 68° to 84°, with overnight lows between 44° and 64°. The average high for September is 75° with an average low of 53°. 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.
