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°
66°
6
82°
59°
7
83°
59°
8
87°
67°
9
90°
69°
10
80°
58°
11
75°
55°
12
82°
62°
13
81°
63°
14
80°
55°
15
84°
62°
16
82°
61°
17
79°
60°
18
78°
55°
19
80°
57°
20
80°
59°
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 74° to 90°, with overnight lows between 46° and 69°. The average high for September is 80° 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.
