Pittsburgh, Pennsylvania weather in September

Averages from 2021–2025 (150 days of record).

Average high: 76°F
Average low: 58°F
Rainy days: ~11 per month
Total precipitation: 3.7 in
Warmest recorded: 92°F
Coldest recorded: 43°F

Expect September days in Pittsburgh, Pennsylvania to top out around 76°F and cool to about 58°F overnight, with roughly 11 days of measurable rain across the month. In recent years September has ranged from 43°F to 92°F.

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Current Pittsburgh, Pennsylvania forecast → · Historical data by Open-Meteo (ERA5).