Philadelphia
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Philadelphia, PA

The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania
The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania
Weather in May brings Philadelphia to a more pleasant zone as the temperature rises to the range of 54°F (12.2°C) and 73.8°F (23.2°C).
The sun shines for up to seven and a half hours per day, making the days warm and lovely for outdoor ventures.
Spring blossoms fill Philadelphia with pleasant scents and fresh air, making the entire downtown look like one massive flower garden. Tourists take to the gardens and parks to enjoy the beauty of the blossoms, as picnicking and sight-seeing become the main activities.

What is the temperature in May in Philadelphia?

In May, in Philadelphia, Pennsylvania, the average high-temperature is 73.8°F (23.2°C), and the average low-temperature is 54°F (12.2°C).

What is the average humidity in May in Philadelphia?

The average relative humidity in May in Philadelphia, Pennsylvania, is 65.4%.

How much does it rain in Philadelphia in May?

In Philadelphia, Pennsylvania, in May, it is raining for 11.1 days, with typically 3.7" (94.2mm) of accumulated precipitation.

Does it snow in Philadelphia in May?

In May, in Philadelphia, Pennsylvania, it doesn't snow. April is the latest month when it typically snows.

How cold is the water in May in Philadelphia?

In Philadelphia, the average seawater temperature in May is 54°F (12.2°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average length of the day in May in Philadelphia?

In May, the average length of the day is 14.4h.

How many hours of sunshine does Philadelphia have in May?

In Philadelphia, the average sunshine in May is 7.9h.

How high is the UV index in May in Philadelphia?

In Philadelphia, the average daily maximum UV index in May is 8. A UV Index reading of 8 to 10 represents a very high hazard to health from unprotected exposure to the UV radiation.
Average temperature in May - Philadelphia, PA
  • Average high temperature in May: 73.8°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (40.3°F).

  • Average low temperature in May: 54°F

The month with the highest average low temperature is July (69.2°F).
The coldest month (with the lowest average low temperature) is January (25.6°F).

Average humidity in May - Philadelphia, PA
  • Average humidity in May: 65.4%

The month with the highest relative humidity is September (71.6%).
The month with the lowest relative humidity is April (60.4%).

Average rainfall in May - Philadelphia, PA
  • Average rainfall in May: 3.7"

The wettest month (with the highest rainfall) is July (4.4").
The driest month (with the lowest rainfall) is February (2.7").

Average rainfall days in May - Philadelphia, PA
  • Average rainfall days in May: 11.1 days

The month with the highest number of rainy days is April (11.3 days).
The month with the lowest number of rainy days is August (8.4 days).

Average snowfall in May - Philadelphia, PA
  • Average snowfall in May: 0"

The month with the highest snowfall is February (8.8").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in May - Philadelphia, PA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (4.4 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in May - Philadelphia, PA
  • Average sea temperature in May: 53.9°F

The best month for swimming (with the highest average sea temperature) is August (75.9°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

Average daylight in May / Average sunshine in May - Philadelphia, PA
  • Average daylight in May: 14.4h

The month with the longest days is June (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9.4h).

  • Average sunshine in May: 7.9h

The month with most sunshine is June (Average sunshine: 9h).
The month with least sunshine is December (Average sunshine: 4.4h).

Average UV index in May - Philadelphia, PA
  • Average UV index in May: 8

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).