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
Philadelphia's May weather shows an increase in high-temperatures, moving from April's refreshing 61.7°F (16.5°C) to an agreeable 72°F (22.2°C). An average low-temperature of 55°F (12.8°C) is recorded in the month of May in Philadelphia.Humidity
The average relative humidity in May is 75%.Rainfall
In May, the rain falls for 14.4 days. Throughout May, 1.3" (33mm) of precipitation is accumulated. Throughout the year, there are 127.8 rainfall days, and 13.82" (351mm) of precipitation is accumulated.Snowfall
January through May, November and December are months with snowfall. 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, there are 11.4 snowfall days, and 2.87" (73mm) of snow is accumulated.Ocean temperature
In Philadelphia, in May, the average water temperature is 54°F (12.2°C).Note: Diving into 54°F (12.2°C) is practical below 50°F (10°C), given you're wearing protective swim gear; without it, expect a quick onset of cold shock and a struggle to breathe. Merely touching waters at 55.4°F (13°C) feels ice-cold.
Daylight
The average length of the day in May in Philadelphia is 14h and 24min.On the first day of May, 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
In May, the average sunshine 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 risk from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 6 during May leads to these instructions:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Frequently asked questions
What are the temperatures in Philadelphia in May?
What is the average humidity in May in Philadelphia?
How many days does it rain in May in Philadelphia?
What is the last month it snows in Philadelphia?
What is the ocean temperature in May in Philadelphia?
How many hours of daylight does Philadelphia have in May?
What time are sunrise and sunset in May in Philadelphia?
How long on average sun shines in May in Philadelphia?
When is the highest UV index in Philadelphia?
What is the UV index intensity in May in Philadelphia?
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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