Philadelphia, Pennsylvania weather in May

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

Average high: 74°F
Average low: 54°F
Rainy days: ~12 per month
Total precipitation: 4.4 in
Warmest recorded: 94°F
Coldest recorded: 39°F

Expect May days in Philadelphia, Pennsylvania to top out around 74°F and cool to about 54°F overnight, with roughly 12 days of measurable rain across the month. In recent years May has ranged from 39°F to 94°F.

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