Forecast Details for Chicago, IL

Recent Locations: Chicago, IL  
Overnight: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a steady temperature around 60. South wind around 15 mph, with gusts as high as 25 mph.
Saturday: A slight chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 80. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 20%.
Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 61. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Sunday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Mostly cloudy, with a high near 76. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Sunday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 10pm. Low around 61. Breezy, with a south wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Monday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 72.
Monday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 52. Chance of precipitation is 20%.
Tuesday: Sunny, with a high near 72.
Tuesday Night: A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 58.
Wednesday: A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 76.
Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Thursday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 70.
Thursday Night: A chance of showers. Mostly cloudy, with a low around 52.
Friday: Partly sunny, with a high near 62.

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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).

Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

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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.

North American Water Vapor Map

Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

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