Click on a day for an hourly weather forecast
The temperatures in Pittsburgh in September are comfortable with low of 14°C and and high up to 25°C.
You can expect about 3 to 8 days of rain in Pittsburgh during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Pittsburgh in September 2025.
If you’re planning to visit Pittsburgh in the near future, we highly recommend that you review the 14 day weather forecast for Pittsburgh before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -6° | 8 | 5 | 19 | 127 mm | Awful | Pittsburgh in January |
| February | 3° / -5° | 9 | 5 | 16 | 138 mm | Awful | Pittsburgh in February |
| March | 9° / 0° | 9 | 13 | 9 | 136 mm | Awful | Pittsburgh in March |
| April | 16° / 5° | 10 | 16 | 4 | 171 mm | Bad | Pittsburgh in April |
| May | 22° / 11° | 10 | 21 | 0 | 181 mm | Ok | Pittsburgh in May |
| June | 27° / 15° | 9 | 21 | 0 | 201 mm | Good | Pittsburgh in June |
| July | 29° / 18° | 10 | 21 | 0 | 199 mm | Ok | Pittsburgh in July |
| August | 29° / 17° | 7 | 24 | 0 | 149 mm | Ok | Pittsburgh in August |
| September | 25° / 14° | 6 | 24 | 0 | 146 mm | Perfect | Pittsburgh in September |
| October | 17° / 8° | 8 | 23 | 0 | 143 mm | Ok | Pittsburgh in October |
| November | 10° / 2° | 8 | 17 | 6 | 104 mm | Awful | Pittsburgh in November |
| December | 4° / -2° | 9 | 9 | 13 | 140 mm | Awful | Pittsburgh in December |