Philadelphia, Pennsylvania weather in August

Averages from 2021–2025 (155 days of record).

Average high: 86°F
Average low: 68°F
Rainy days: ~11 per month
Total precipitation: 4.2 in
Warmest recorded: 99°F
Coldest recorded: 55°F

Expect August days in Philadelphia, Pennsylvania to top out around 86°F and cool to about 68°F overnight, with roughly 11 days of measurable rain across the month. In recent years August has ranged from 55°F to 99°F.

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