Forecast Details for Chicago O'Hare International Airport, IL

Recent Locations: Chicago O'Hare International Airport, IL

Today: Periods of drizzle before 10am. Areas of fog before 10am. Otherwise, cloudy, with a high near 59. North wind around 10 mph.

Tonight: Mostly cloudy, with a low around 42. East northeast wind around 5 mph.

Sunday: Showers likely, mainly after 1pm. Mostly cloudy, with a high near 52. Breezy, with an east wind 10 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Sunday Night: Showers and possibly a thunderstorm. Low around 51. East wind around 15 mph becoming south after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 90%.

Monday: A 50 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 57. Breezy, with a south wind 15 to 20 mph becoming west in the afternoon. Winds could gust as high as 35 mph.

Monday Night: Partly cloudy, with a low around 41.

Tuesday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 65.

Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 50.

Wednesday: Mostly sunny, with a high near 69.

Wednesday Night: A chance of showers after 1am. Mostly cloudy, with a low around 50.

Thursday: A chance of showers. Partly sunny, with a high near 67.

Thursday Night: A chance of showers. Mostly cloudy, with a low around 51.

Friday: Showers likely. Mostly cloudy, with a high near 64.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds

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