S
M
T
W
T
F
S
30
85°
65°
31
84°
72°
1
93°
71°
2
94°
73°
3
92°
71°
4
85°
65°
5
81°
62°
6
81°
63°
7
80°
59°
8
76°
61°
9
82°
63°
10
79°
60°
11
80°
55°
12
76°
56°
13
78°
54°
14
79°
61°
15
78°
60°
16
75°
60°
17
76°
56°
18
72°
51°
19
75°
55°
20
80°
59°
21
80°
59°
22
79°
58°
23
80°
59°
24
80°
58°
25
79°
56°
26
77°
56°
27
78°
57°
28
78°
57°
29
77°
56°
30
76°
52°
1
73°
52°
2
75°
53°
3
76°
55°
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 72° to 94°, with overnight lows between 51° and 73°. The average high for September is 80° 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.
