Forecast Details for Philadelphia, PA

Recent Locations: New York City, NY Philadelphia, PA

Current Alerts for Philadelphia, PA: Air Quality Alert

Today: Sunny and hot, with a high near 99. Heat index values as high as 102. Calm wind becoming west around 5 mph in the afternoon.

Tonight: Mostly clear, with a low around 78. Southwest wind around 5 mph.

Wednesday: Sunny and hot, with a high near 98. Heat index values as high as 103. Light southwest wind increasing to 5 to 10 mph in the morning.

Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 77. Southwest wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 87. East wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Thursday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 68. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

Friday: Showers likely, mainly before 8am. Cloudy, with a high near 75. Chance of precipitation is 60%.

Friday Night: Partly cloudy, with a low around 64.

Saturday: Sunny, with a high near 81.

Saturday Night: Mostly clear, with a low around 62.

Sunday: Sunny, with a high near 84.

Sunday Night: Partly cloudy, with a low around 64.

Monday: Mostly sunny, with a high near 84.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What are Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds