Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average sea temperature in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
As Philadelphia transitions into May, a rise in the average high-temperature is observed, moving from a refreshing 61.7°F (16.5°C) in April to a pleasant 72°F (22.2°C). May's average low-temperature reading settles at a cool 55°F (12.8°C).Humidity
In May, the average relative humidity is 75%.Rainfall
In Philadelphia, Pennsylvania, during May, the rain falls for 14.4 days and regularly aggregates up to 1.3" (33mm) of 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. During 0.1 snowfall days, in May, Philadelphia aggregates 0.12" (3mm) of snow. Throughout the year, there are 11.4 snowfall days, and 2.87" (73mm) of snow is accumulated.Ocean temperature
In Philadelphia, the average seawater temperature in May is 54°F (12.2°C).Note: Swimming in 54°F (12.2°C) is deemed hazardous. Exposure to temperatures below 50°F (10°C) leads to immediate severe cold shock and hyperventilation.
Daylight
In May, the average length of the day is 14h and 24min.On the first day of May in Philadelphia, sunrise is at 5:59 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
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 value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for average individuals.Note: The UV index of 6 in May translates into these instructions:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in May?
What is the average humidity in May?
How much does it rain in May?
What is the last month it snows?
How cold is the water in May?
What is the average length of the day in May?
What time are sunrise and sunset in May?
How many hours of sunshine does Philadelphia have in May?
What is the month with the highest UV index?
What is the UV index intensity in May?
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).
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).
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).
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%).
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").
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).
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").
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).
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: 14h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in May: 8h and 4min
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).
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).
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).
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).
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).
Philadelphia, Pennsylvania, USA
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