Expect mostly cold nights with cool to comfortable days.
Daytime high temperatures will average around 59-61 F (15-16 C) early in April, warming to 67-69 F (about 20 C) near the end of the month.
A few of the warmer afternoons, especially late in the month, can reach up near 81 F (27 C). The record high temperature in Philadelphia during April is 95 F (35 C).
Late night and early morning low temperatures tend to be around 40-42 F (about 5 C) early in the month but will warm to near 48-50 F (9-10 C) by the end of the month.
A few of the colder mornings, especially early in the month, can dip down near 30 F (-1 C). The record low temperature in Philadelphia during April is 19 F (-7.2 C).
Sky, Rain and Snow
During April you can expect, on average, about 7 sunny, 9 partly sunny, and 14 mostly cloudy days.
Some precipitation falls on 10-11 days, however, only 2 of these record significant rainfalls of 0.5 inches (12.7 mm) or more.
Snowfall is rare, occurring only once every 5 years with 1 inch (2.5 cm) or more falling only about once every decade.
The number of daylight hours increases rapidly this month from about 12.7 hours on the 1st to about 13.9 hours by the 30th.
Wind speeds are light to gentle at 4-12 mph (6-19 kph) but can occasionally be moderate at 13-18 mph (20-28 kph).
What to Wear in Philadelphia During April?
April is a transition month from winter to Spring so a mix of both winter and spring attire makes the most sense.
You should pack both long and short-sleeve tops, jeans, a few sweaters, sneakers, and some comfortable walking shoes.
Things to Do in Philadelphia in April
Although it will still probably be pretty cold this month, chances are that there will be a few more sunny days than usual, so you might want to consider taking a pay-what-you-wish Philadelphia walking tour.
April means the opening of the MLB season, and the Philadelphia Phillies are one of the hottest teams in baseball, so you might want to head down to the ballpark this month.
For even more ideas, make sure to check our full post covering things to do in Philadelphia in April.