Pittsburgh weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: April – October
What is the weather like in Pittsburgh in September?
In September, Pittsburgh is warm: daytime highs average 24 °C, and nights cool down to about 15 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 104 mm in total. All in all, September is a good month for a holiday in Pittsburgh.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 72 | 75 | 69 |
| Day | 28° | 24° | 18° |
| Night | 18° | 15° | 9° |
| Sun | 7 h | 6 h | 5 h |
| Rain days | 12 | 10 | 11 |
More details for September
- Daylight
- 12 h 32 min07:00 – 19:31
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 5 daysdew point 18 °C or moreAll months
- Wind
- 13 km/haverage daily peakAll months
- Cloud cover
- 53 %on averageAll months
- Hot days
- 3 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %45 %
- Few rainy daysweight 30 %55 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Pittsburgh in September: quick answers
Is Pittsburgh hot in September?
Warm rather than hot: in September, daytime highs in Pittsburgh average 24 °C and nights cool to about 15 °C. On about 3 days the thermometer climbs to 30 °C or more.
Does it rain much in Pittsburgh in September?
Rain is frequent, with about 10 rainy days and 104 mm in total.
Pittsburgh month by month
The whole year in PittsburghAll destinations: USAWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences