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
61°
55°
23
64°
49°
24
67°
46°
25
70°
48°
26
71°
50°
27
71°
52°
28
74°
55°
29
74°
58°
30
76°
57°
1
69°
53°
2
68°
49°
3
67°
56°
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 61° to 76°, with overnight lows between 46° and 58°. The average high for September is 69° with an average low of 52°. 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.
