S
M
T
W
T
F
S
30
81°
63°
31
82°
63°
1
83°
59°
2
77°
57°
3
79°
59°
4
76°
63°
5
76°
57°
6
75°
54°
7
79°
62°
8
80°
63°
9
81°
61°
10
78°
59°
11
74°
53°
12
80°
60°
13
76°
56°
14
75°
55°
15
78°
56°
16
80°
57°
17
81°
60°
18
80°
54°
19
71°
50°
20
70°
49°
21
75°
58°
22
77°
55°
23
78°
51°
24
68°
48°
25
68°
48°
26
69°
47°
27
67°
47°
28
72°
50°
29
72°
48°
30
73°
54°
1
71°
49°
2
65°
46°
3
64°
47°
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 83°, with overnight lows between 46° and 63°. The average high for September is 75° with an average low of 55°. 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.
