Forecast Details for Philadelphia, PA

Recent Locations: Philadelphia, PA  
Current Alerts for Philadelphia, PA: Special Weather Statement
Overnight: A slight chance of showers. Patchy fog. Otherwise, mostly cloudy, with a low around 70. Light south wind. Chance of precipitation is 20%.
Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 11am. Some storms could be severe, with damaging winds and heavy rain. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 84. Southwest wind 6 to 9 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night: Showers and thunderstorms, mainly before 11pm. Some storms could be severe, with damaging winds and heavy rain. Low around 60. West wind 8 to 10 mph becoming north after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday: A slight chance of showers before 8am, then a chance of rain after 2pm. Mostly cloudy, with a high near 69. East wind around 8 mph. Chance of precipitation is 30%.
Thursday Night: Rain likely, with thunderstorms also possible after midnight. Some of the storms could produce heavy rainfall. Cloudy, with a low around 60. Northeast wind 3 to 7 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Friday: A chance of rain. Cloudy, with a high near 71. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night: Mostly cloudy, with a low around 61.
Saturday: Mostly sunny, with a high near 74.
Saturday Night: Mostly clear, with a low around 58.
Sunday: Mostly sunny, with a high near 71.
Sunday Night: Partly cloudy, with a low around 58.
Monday: Mostly sunny, with a high near 72.
Monday Night: Mostly cloudy, with a low around 63.
Tuesday: Partly sunny, with a high near 78.

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Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

precipitation Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain

Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow