May weather forecast
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

May, the last month of the spring in Philadelphia, is an agreeable month, with an average temperature ranging between min 55°F (12.8°C) and max 72°F (22.2°C).

Temperature

In Philadelphia, the average high-temperature in May increases from an enjoyable 61.7°F (16.5°C) in April to an agreeable 72°F (22.2°C). In May, the average low-temperature is 55°F (12.8°C).

Humidity

In May, the average relative humidity in Philadelphia is 75%.

Rainfall

In Philadelphia, Pennsylvania, it is raining for 14.4 days, with typically 1.3" (33mm) of accumulated precipitation. Throughout the year, there are 127.8 rainfall days, and 13.82" (351mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, November and December. May is the last month it regularly snows in Philadelphia. During 0.1 snowfall days, in May, Philadelphia aggregates 0.12" (3mm) of snow. Throughout the year, in Philadelphia, Pennsylvania, there are 11.4 snowfall days, and 2.87" (73mm) of snow is accumulated.

Ocean temperature

In Philadelphia, Pennsylvania, the average seawater temperature in May is 54°F (12.2°C).
Note: Swimming in 54°F (12.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In Philadelphia, the average length of the day in May is 14h and 24min.
On the first day of May, sunrise is at 6:00 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 5:34 am and sunset at 8:22 pm EDT.

Sunshine

In Philadelphia, the average sunshine in May is 8.6h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 6 in May interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in May in Philadelphia?

In Philadelphia, in May, the average high-temperature is 72°F (22.2°C), and the average low-temperature is 55°F (12.8°C).

What is the average humidity in May in Philadelphia?

The average relative humidity in May in Philadelphia, Pennsylvania, is 75%.

How much does it rain in Philadelphia in May?

In Philadelphia, Pennsylvania, in May, it is raining for 14.4 days, with typically 1.3" (33mm) of accumulated precipitation.

What is the last month it snows in Philadelphia?

May is the last month it regularly snows in Philadelphia, Pennsylvania. During 0.1 snowfall days, in May, Philadelphia aggregates 0.12" (3mm) of snow.

What is the water temperature in May in Philadelphia?

In Philadelphia, in May, the average water temperature is 54°F (12.2°C). Swimming in 54°F (12.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Philadelphia have in May?

In May, the average day length in Philadelphia is 14h and 24min.

When are sunrise and sunset in May in Philadelphia?

In May, on the first day of the month, sunrise is at 6:00 am and sunset at 7:55 pm. On the last day of the month, in Philadelphia, Pennsylvania, sunrise is at 5:34 am and sunset at 8:22 pm EDT.

How long on average sun shines in May in Philadelphia?

The average sunshine duration in May in Philadelphia is 8.6h.

When is the highest UV index in Philadelphia?

The months with the highest UV index in Philadelphia are May through August, with an average maximum UV index of 6.

What is the UV index reading in May in Philadelphia?

In May, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Philadelphia, PA

Average temperature in May - Philadelphia, PA
  • Average high temperature in May: 72°F

The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (37.4°F).

  • Average low temperature in May: 55°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (25.5°F).

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Average pressure in May
Philadelphia, PA

Average pressure in May - Philadelphia, PA
  • Average pressure in May: 30.01"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in May
Philadelphia, PA

Average wind speed in May - Philadelphia, PA
  • Average wind speed in May: 6.9mph

The windiest months (with the highest average wind speed) are March and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in May
Philadelphia, PA

Average humidity in May - Philadelphia, PA
  • Average humidity in May: 75%

The month with the highest relative humidity is October (77%).
The months with the lowest relative humidity are April and August (71%).

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Average rainfall in May
Philadelphia, PA

Average rainfall in May - Philadelphia, PA
  • Average rainfall in May: 1.3"

The wettest month (with the highest rainfall) is August (1.65").
The driest months (with the least rainfall) are January and February (0.83").

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Average rainfall days in May
Philadelphia, PA

Average rainfall days in May - Philadelphia, PA
  • Average rainfall days in May: 14.4 days

The month with the highest number of rainy days is July (14.8 days).
The month with the least rainy days is February (7.2 days).

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Average snowfall in May
Philadelphia, PA

Average snowfall in May - Philadelphia, PA
  • Average snowfall in May: 0.12"

The month with the highest snowfall is February (0.98").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in May
Philadelphia, PA

Average snowfall days in May - Philadelphia, PA
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature in May
Philadelphia, PA

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).

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Average daylight in May /
Average sunshine in May
Philadelphia, PA

Average daylight in May / Average sunshine in May - Philadelphia, PA
  • Average daylight in May: 14h and 24min

The month with the longest days is June (Average daylight: 14h and 58min).
The month with the shortest days is December (Average daylight: 9h and 23min).

  • Average sunshine in May: 8h and 36min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days in May
Philadelphia, PA

Average sunshine days in May - Philadelphia, PA
  • Average sunshine days in May: 13.3 days

The month with the most sunshine days is December (20.9 days).
The month with the least sunshine days is May (13.3 days).

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Average UV index in May
Philadelphia, PA

Average UV index in May - Philadelphia, PA
  • Average UV index in May: 6

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in May
Philadelphia, PA

Average cloud cover in May - Philadelphia, PA
  • Average cloud cover in May: 46

The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in May
Philadelphia, PA

Average visibility in May - Philadelphia, PA
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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