Philadelphia
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Philadelphia, PA

The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania
The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania
The primary climate of Philadelphia is the humid subtropical climate (Köppen climatic classification Cfa), characterized by hot, muggy summers and moderately cold winters. The largest city of Pennsylvania and one of the most populated cities in the United States has a diverse climate as a result of the various geographical characteristics encompassing the region. This climate is influenced by the position of Philadelphia on the Delaware and Schuylkill Rivers' confluence, and the Appalachian Mountains on the West, and the Atlantic Ocean on the East.

Spring and autumn are highly variable but mostly are characterized by mild, tolerable weather. Humidity is equitably distributed throughout the year, with the highest record of 71% and the lowest record of averaging 60%.

Summer in Philadelphia is hot and muggy, with the warmest month being July. Summer also receives moderately higher precipitation than the other seasons, with July being the rainiest month of the year.

Winter has variable snowfall periodically alternating between light and episodes of significant snow accompanied by snowstorms. The nights during winter are quite chilly, but during the day, the temperate is mild and pleasant. With warm clothing, life goes on as usual.
The best time to visit Philadelphia is during spring and autumn. During spring, specifically in April and May, the winter chill dies off leaving most days warm and pleasant, with the temperature in the range of 44.1°F (6.7°C) and 73.8°F (23.2°C). Most days receive up to seven and a half hours of sunshine and moderately low rainfall, making touring Philadelphia much easier.
The blossoming of the flowers in the parks makes Philadelphia magnificent, and tourists enjoy picnicking under the pleasant weather in many parks and gardens around Philadelphia. During autumn, the heat of summer drops down into a pleasantly cool, with the temperature in the range of 48.4°F (9.1°C) and 66.6°F (19.2°C). The fall brings striking beauty to Philadelphia, leaving the entire downtown Philadelphia in a golden brown illumination.
Both seasons have fewer crowds, and it becomes comfortable to tour Philadelphia, even late into the evening. With fair prices and minimal crowds in Philadelphia, these two seasons offer an excellent time to visit and enjoy the festivities and celebrations in the tourist destination.

Summer may not be the best time to visit Philadelphia. The temperatures are quite high - making most days feel very hot. Humidity is also the highest during summer, and most days appear muggy and uncomfortable.
A light dressing is advised during summer, as well as using sunscreen and sunglasses too in the hot sun. It is essential to rest under shades throughout as the UV index is at the highest during summer. Towards the end of summer, Philadelphia experiences thunderstorms and lightning storms that pose great danger. The high rainfall during the summer months also occasionally brings flooding in Philadelphia that can cause significant harm and damage.

Philadelphia is prone to several weather hazards beginning with flooding during the rainy season. Thunderstorms accompanying the rains also pose significant damage. During winter, the weather variations can cause increased snowfall that can result in snowstorms aided by the strong winter winds that dominate the season.

January is quite cold in Philadelphia with the mercury holding in the range of 25.5°F (-3.6°C) and 40.3°F (4.6°C). Weather in January »

February is cold with the temperature in the range of 27.7°F (-2.4°C) and 43.9°F (6.6°C). The nights are chilly throughout; hence, additional warm clothing is vital. Weather in February »

As the weather changes gradually, the mercury stretches to the range of 34.3°F (1.3°C) and 52.7°F (11.5°C). Most days are tolerable, but the nights are still cold, as the winter winds still blow hard at night. Weather in March »

In April, Philadelphia begins to enjoy the spring weather with the temperature rising to the range of 44.1°F (6.7°C) and 63.9°F (17.7°C). Weather in April »

Weather in May brings Philadelphia to a more pleasant zone as the temperature rises to the range of 54°F (12.2°C) and 73.8°F (23.2°C). Weather in May »

Summer comes to Philadelphia in June and is characterized by a rise in the temperature range to 63.9°F (17.7°C) and 82.8°F (28.2°C). Weather in June »

July is Philadelphia's hottest month with the mercury varying in the range of 69.3°F (20.7°C) to 87.1°F (30.6°C). Weather in July »

A slight reduction in the temperature to the range of 67.8°F (19.9°C) and 85.3°F (29.6°C) introduces the warm August weather to Philadelphia. Weather in August »

The mercury drops to the warm and pleasant range of 60.3°F (15.7°C) to 78.1°F (25.6°C), and the excess summer heat dies off. Weather in September »

October is one of the loveliest months of the year in Philadelphia. The temperature drops to a lovely range of 48.4°F (9.1°C) and 66.2°F (19°C). Weather in October »

November weather varies, with the first few days experiencing warm autumn weather, and gradually cooling down as winter settles. The mercury remains within the range of 39.2°F (4°C) and 55.9°F (13.3°C). Weather in November »

The weather is characterized by low temperature in the range of 30°F (-1.1°C) and 44.8°F (7.1°C). The nights get colder, with the temperature occasionally dropping below 25°F (-3.9°C). Weather in December »

What is the coldest month in Philadelphia?

The coldest month in Philadelphia, Pennsylvania, is January, with an average high-temperature of 40.3°F (4.6°C) and an average low-temperature of 25.5°F (-3.6°C).

How many days does it rain in Philadelphia?

In Philadelphia, Pennsylvania, during the entire year, the rain falls for 118.2 days and collects up to 41.5" (1054.8mm) of precipitation.

When does it snow in Philadelphia?

January through April, November and December are months with snowfall.

How many days does it snow in Philadelphia?

Throughout the year, in Philadelphia, Pennsylvania, there are 12.2 snowfall days, and 22.4" (569mm) of snow is accumulated.

What is the month with the lowest UV index in Philadelphia?

January, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Philadelphia, Pennsylvania.

What is the driest month in Philadelphia?

February is the month with the least rainfall in Philadelphia, Pennsylvania. Rain falls for 9.4 days and accumulates 2.6" (67.3mm) of precipitation.

When does it snow the most in Philadelphia?

February is the month with the most snowfall. Snow falls for 3.6 days and accumulates 8.8" (223.5mm) of snow.

When is the ocean coldest in Philadelphia?

February is the month with the coldest seawater, with an average ocean temperature of 39.9°F (4.4°C).

What is the least humid month in Philadelphia?

With an average relative humidity of 60.4%, April is the least humid month.

When are the longest days in Philadelphia?

June has the longest days of the year, with an average of 15h of daylight.

What month has the most sunshine in Philadelphia?

The month with the most sunshine in Philadelphia is June, with an average of 9h of sunshine.

What is the month with the highest UV index in Philadelphia?

June and July, with an average maximum UV index of 9, are months with the highest UV index in Philadelphia, Pennsylvania.

What is the warmest month in Philadelphia?

The warmest month in Philadelphia, Pennsylvania, is July, with an average high-temperature of 87.1°F (30.6°C) and an average low-temperature of 69.3°F (20.7°C).

What is the wettest month in Philadelphia?

The month with the most rainfall is July when the rain falls for 9.9 days and typically aggregates up to 4.4" (110.5mm) of precipitation.

What month is the ocean warmest in Philadelphia?

The month with the warmest seawater is August, with an average ocean temperature of 75.9°F (24.4°C).

What is the most humid month in Philadelphia?

The most humid month in Philadelphia, Pennsylvania, is September, with an average relative humidity of 71.6%.

What is the month with the shortest days in Philadelphia?

December has the shortest days of the year, with an average of 9.4h of daylight.

What is the month with the least sunshine in Philadelphia?

December has the least sunshine of the year, with an average of 4.4h of sunshine.
Average temperature - Philadelphia, PA
Average humidity - Philadelphia, PA

The month with the highest relative humidity is September (71.6%).
The month with the lowest relative humidity is April (60.4%).

Average rainfall - Philadelphia, PA
Average rainfall days - Philadelphia, PA

The month with the highest number of rainy days is April (11.3 days).
The month with the lowest number of rainy days is August (8.4 days).

Average snowfall - Philadelphia, PA
Average snowfall days - Philadelphia, PA

The month with the highest number of snowfall days is January (4.4 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature - Philadelphia, PA

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 / Average sunshine - Philadelphia, PA