Arlington Heights Weather Forecast/Update: Cooler, Temps Dropping From 59 Degrees; Heavy Rain Overnight; High 41 Monday

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Chicagoland weather radar [LIVE PRECIPITATION TYPE RADAR] shows a large area of precipitation that is diminishing as it approaches Chicagoland from the southwest.

Rain forecast for today has not arrived or developed in Chicagoland, but is still expected to arrive as heavy rain tonight.

Temperatures have also come in lower than forecast. The early morning forecast called for a high of 71 degrees with temps dropping after 1:00 p.m., but a cold frontal boundary settled over northern and northeastern Illinois and brought cooler air earlier than expected. The high only reached 68 degrees at about 10:51 a.m. and dropped to 61 degrees by 11:51 a.m. and 51 by 12:51 p.m. Temperatures in the mid-40s have been recorded with fog near the Lake Michigan shore. Temperatures in Arlington Heights are forecasts to hit the upper 40s about midnight.

NWS Chicago outlook.

TODAY Sunrise: 6:12 AM Sunset: 7:31 PM
Showers and possibly a thunderstorm before 5pm, then showers and thunderstorms after 5pm. Areas of fog. High near 65. East northeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight Showers and thunderstorms before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then showers and thunderstorms after 2am. Some of the storms could produce heavy rainfall. Areas of fog before 8pm. Low around 37. North northwest wind 5 to 10 mph becoming north 10 to 15 mph after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Monday Rain showers before 2pm, then a chance of rain and snow showers. The rain could be heavy at times. Some thunder is also possible. High near 41 at about 4:00 p.m. Breezy, with a north wind 15 to 20 mph, with gusts as high as 25 mph all day Monday. Chance of precipitation is 100%. Little or no snow accumulation expected, but some snowflakes might be in the air.

Monday Night A chance of rain and snow showers before 8pm, then a chance of snow showers between 8pm and 2am. Cloudy, then gradually becoming partly cloudy, with a low around 25. North wind 10 to 15 mph, with gusts as high as 20 mph. Gusts are forecast to die down after 1:00 a.m. Chance of precipitation is 40%.

Tuesday Mostly sunny, with a high near 41. North northwest wind around 10 mph becoming northeast in the afternoon.

Tuesday Night Partly cloudy, with a low around 28.

Wednesday Mostly sunny, with a high near 51.

Wednesday Night Partly cloudy, with a low around 37.

Thursday A slight chance of rain. Partly sunny, with a high near 57.

Thursday Night A chance of rain. Mostly cloudy, with a low around 38.

Friday A chance of rain. Mostly cloudy, with a high near 52.

Friday Night A chance of rain. Mostly cloudy, with a low around 37.

Saturday A chance of rain. Mostly cloudy, with a high near 55.

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