Philadelphia Average Rainfall by Month

This page shows the average precipitation (including snowfall) in each month of the year in Philadelphia, Pennsylvania. It is based on NOAA data for the years 1991–2020.

Average temperature by month

What's the Rainiest Month in Philadelphia?

In Philadelphia, September has the greatest precipitation of any month. On average, Philadelphia gets 4.4 inches of precipitation in September.

However, April is the month with the greatest chance of precipitation. 36.4% of days in April will have at least some rain or snow.

What's the Driest Month in Philadelphia?

In Philadelphia, February has the least precipitation of any month. On average, Philadelphia gets 2.75 inches of precipitation in February.

November is the month with the lowest chance of precipitation. 28.8% of days in November will have measurable rain or snow.

Month	Precipitation	% Chance
January	3.13 in	35.6
February	2.75 in	33.9
March	3.96 in	35.1
April	3.47 in	36.4
May	3.34 in	35.6
June	4.04 in	34.3
July	4.38 in	32.5
August	4.29 in	28.8
September	4.40 in	31.0
October	3.47 in	29.5
November	2.90 in	28.8
December	3.97 in	35.4
Year	44.09 in	33.1

Weather Station Details

Years	Station	Coordinates
1941–2024	Philadelphia International Airport	location
1916–1940	Philadelphia Naval Yard	location
1894–1915	Drexel University	location