S
M
T
W
T
F
S
30
78°
56°
31
81°
60°
1
84°
54°
2
77°
55°
3
78°
56°
4
79°
61°
5
83°
63°
6
84°
61°
7
81°
61°
8
77°
59°
9
82°
61°
10
82°
60°
11
76°
60°
12
80°
61°
13
80°
57°
14
74°
51°
15
73°
52°
16
74°
52°
17
74°
55°
18
77°
57°
19
79°
58°
20
80°
59°
21
73°
52°
22
78°
55°
23
72°
57°
24
78°
53°
25
74°
48°
26
69°
55°
27
76°
54°
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 69° to 84°, with overnight lows between 48° and 63°. The average high for September is 78° 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.
