April weather forecastPhiladelphia, PA
April
Weather in April
April brings a tangible touch of spring to Philadelphia, Pennsylvania, with weather conditions growing significantly warmer and pleasant. Compared to March, the rise in temperature becomes more apparent, reaching pleasantly high averages. April also welcomes an increase in rainfall, at approximately 1.18" (30mm). Appreciably longer days with over 13 hours of daylight make outdoor excursions more appealing. As April nears its end, residents look forward to even sunnier days ahead.Temperature
April brings an increase in the average high-temperature, progressing from a chilly 49.8°F (9.9°C) in March to a refreshing 61.7°F (16.5°C). Throughout April, Philadelphia experiences a low-temperature average of 45.1°F (7.3°C).Humidity
The months with the lowest humidity are April and August, with an average relative humidity of 71%.Rainfall
In Philadelphia, in April, it is raining for 12.4 days, with typically 1.18" (30mm) of accumulated precipitation. In Philadelphia, during the entire year, the rain falls for 127.8 days and collects up to 13.82" (351mm) of precipitation.Snowfall
January through May, November and December are months with snowfall. In Philadelphia, during April, snow falls for 0.1 days and regularly aggregates up to 0.08" (2mm) 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 seawater temperature in April is 46.8°F (8.2°C).Note: It is advised against swimming in 46.8°F (8.2°C) when it drops below 50°F (10°C). Such temperatures can cause extreme cold shock, leading to hyperventilation.
Daylight
In Philadelphia, the average length of the day in April is 13h and 17min.On the first day of the month, sunrise is at 6:43 am and sunset at 7:25 pm. On the last day of April, sunrise is at 6:00 am and sunset at 7:54 pm EDT.
Sunshine
In April, the average sunshine is 8.4h.UV index
The average daily maximum UV index in April is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 4 during April translates into these guidelines:
Exercise prevention - Protecting skin and eyes from harm is required. When the Sun is at its strongest around midday, find shade and limit exposure. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Philadelphia, PA
- Average high temperature in April: 61.7°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 April: 45.1°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 April
Philadelphia, PA
- Average pressure in April: 29.99"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 April
Philadelphia, PA
- Average wind speed in April: 8.5mph
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 April
Philadelphia, PA
- Average humidity in April: 71%
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 April
Philadelphia, PA
- Average rainfall in April: 1.18"
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 April
Philadelphia, PA
- Average rainfall days in April: 12.4 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 April
Philadelphia, PA
- Average snowfall in April: 0.08"
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 April
Philadelphia, PA
- Average snowfall days in April: 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 April
Philadelphia, PA
- Average sea temperature in April: 46.7°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 April /
Average sunshine in April
Philadelphia, PA
- Average daylight in April: 13h and 18min
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 April: 8h and 24min
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 April
Philadelphia, PA
- Average sunshine days in April: 15.3 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 April
Philadelphia, PA
- Average UV index in April: 4
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 April
Philadelphia, PA
- Average cloud cover in April: 43
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 April
Philadelphia, PA
- Average visibility in April: 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).
