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

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

Temperature

In Philadelphia, Pennsylvania, 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 Philadelphia, the average low-temperature is 55°F (12.8°C).

Humidity

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

Rainfall

In Philadelphia, during May, the rain falls for 14.4 days and regularly aggregates up to 1.3" (33mm) of precipitation. In Philadelphia, during the entire year, the rain falls for 127.8 days and collects up to 13.82" (351mm) of precipitation.

Snowfall

Months with snowfall in Philadelphia are January through May, November and December. May is the last month it regularly snows in Philadelphia, Pennsylvania. During 0.1 snowfall days, Philadelphia aggregates 0.12" (3mm) of snow. In Philadelphia, during the entire year, snow falls for 11.4 days and aggregates up to 2.87" (73mm) of snow.

Ocean temperature

In Philadelphia, the average water temperature is 54°F (12.2°C).
Note: 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.

Daylight

In May, the average length of the day in Philadelphia is 14h and 24min.
On the first day of May, sunrise is at 6:00 am and sunset at 7:54 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

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 in May transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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, Pennsylvania, 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 is 75%.

How many days does it rain in May in Philadelphia?

In Philadelphia, in May, during 14.4 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

What is the last month it snows in Philadelphia?

May is the last month it regularly snows. 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, Pennsylvania, in May, the average water temperature is 54°F (12.2°C). Swimming in 54°F (12.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Philadelphia have in May?

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

When are sunrise and sunset in May in Philadelphia?

On the first day of May in Philadelphia, Pennsylvania, sunrise is at 6:00 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 5:34 am and sunset at 8:22 pm EDT.

How long on average sun shines in May in Philadelphia?

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

What is the month with the highest UV index in Philadelphia?

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

What is the UV index reading in May in Philadelphia?

The average daily maximum UV index in May in Philadelphia, Pennsylvania, is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unsafe 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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