Weather in Philadelphia in May 2025
Average weather
Average temperature in Philadelphia in May
The expected average maximum temperature in May is +23°C with a maximum of +30°C and a minimum of +7°C.
The average maximum temperature goes up 48% by the end of the month, compared with the beginning of the month, from +16°C to +27°C.
Is Philadelphia warm or cold in May?
Philadelphia is typically warm in May.
Maximum temperatures go up compared to the previous month from +18°C to +23°C. The minimum temperature also goes up from +8°C to +13°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how May is compared to other months in Philadelphia:
Climate in Philadelphia in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +18°C | +23°C | +28°C | ||||
| Min. temperature | ||||||
| -6°C | +1°C | +8°C | ||||
| Max. temperature | ||||||
| +35°C | +36°C | +38°C | ||||
| Rainfall | ||||||
| 97 mm | 99 mm | 99 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 62% | 66% | 67% | ||||
| Air pressure | ||||||
| 1014 HPa | 1015 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 5 | 4 | 4 | ||||
| Cloudy days | ||||||
| 10 | 11 | 11 | ||||
| Rainy days | ||||||
| 15 | 15 | 15 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
May weather is still as good as in April. It’s getting warmer as May arrives. The average maximum temperature goes up from +18°C to +23°C during the day. Prepare for more rain. Average rainfall goes from 97 mm to 99 mm. Humidity rises from 62% to 66%. The average wind speed doesn’t change much during May, staying around 3 m/s. The days becoming less sunny, going from 5 sunny days in April to 4 in May.
June brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Philadelphia is gradually decreasing during May, going from 7 m/s to 3 m/s over the course of the month.
Rain
How was the weather last May in Philadelphia?
Climate Change over Years
The climate in Philadelphia in May has not changed much over the last 43 years.
The average temperature was the lowest in 1996 (+17°C) and the highest in 2012 (+20°C). The driest year was 2001 with only 685 mm of rainfall, and the wettest year was 2023 with 1758 mm.
FAQ
Is May a good time to visit Philadelphia?
Can you sunbathe in Philadelphia in May?
Is Philadelphia rainy in May?
Is it sunny in Philadelphia in May?
Other cities in USA
Monthly weather in Philadelphia
Source of the data
For this page, we’ve looked at the typical weather in Philadelphia, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.