S
M
T
W
T
F
S
30
78°
61°
31
82°
62°
1
78°
56°
2
78°
56°
3
77°
55°
4
77°
54°
5
78°
54°
6
78°
61°
7
81°
60°
8
77°
56°
9
78°
60°
10
80°
55°
11
78°
60°
12
81°
60°
13
81°
59°
14
83°
59°
15
82°
58°
16
81°
59°
17
76°
58°
18
80°
59°
19
79°
58°
20
80°
57°
21
79°
50°
22
78°
49°
23
76°
55°
24
71°
56°
25
Hist. Avg.
72°
53°
26
Hist. Avg.
71°
52°
27
Hist. Avg.
71°
52°
28
Hist. Avg.
70°
52°
29
Hist. Avg.
70°
51°
30
Hist. Avg.
70°
51°
1
Hist. Avg.
69°
50°
2
Hist. Avg.
69°
50°
3
Hist. Avg.
68°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Pittsburgh
Pittsburgh's September 2026 forecast shows daily high temperatures ranging from 71° to 83°, with overnight lows between 49° and 62°. The average high for September is 79° 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.
