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
82°
69°
18
76°
61°
19
71°
60°
20
73°
64°
21
64°
55°
22
62°
56°
23
66°
55°
24
66°
48°
25
74°
48°
26
75°
53°
27
71°
57°
28
69°
59°
29
74°
58°
30
75°
62°
1
78°
61°
2
77°
59°
3
76°
58°
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 69° to 78°, with overnight lows between 48° and 62°. The average high for September is 74° with an average low of 57°. 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.
