The National Weather Service issued a cold-weather advisory for Chicago and other parts of the state this weekend, warning of “dangerously cold wind chills” that could dip as low as 20 to 25 degrees below zero.

A piece of the polar vortex spills into the Midwest, creating extreme cold for the Chicago area and northwest Indiana for the next few days. For Sunday morning, actual air temperatures will peak early and fall throughout the day.

The entire Chicago area will be under a cold weather advisory beginning at 6 p.m. Sunday and running through noon Monday, according to the National Weather Service.

Meteorologists warn to dress properly to avoid frostbite as bone-chilling temperatures move into the Chicago area this week.

Monday, the temperature is expected to drop to minus 3 at O’Hare International Airport. A low of minus 7 is expected at O’Hare Tuesday.

A Cold Weather Advisory is in effect for Chicago with wind chills as low as -25˚, increasing the risk of frostbite in 30 minutes. Warming centers are open throughout the city from Jan. 18 to Jan. 24, including community centers, libraries, park district locations, and police stations.

Temperatures will drop into the single digits and negatives starting Saturday through early next week. Chicagoans should wear lots of layers and limit time outdoors.

CHICAGO - Temperatures on Sunday are in the single digits during the day and will remain so on Monday and Tuesday to start the workweek. Fox 32 Meteorologist Mark Strehl has the forecast. Overnight low temperatures will be diving to about 5 degrees below zero.

Chicago faces cloudy skies and potential snow with risks of slick travel conditions and a plunge in temperatures by the weekend.

In Chicago, snow seasons are tracked from July through the following June. The area normally can expect 38.4 inches, according to the National Weather Service. Chicago was warmer than average during the 2023-24 season due to a La Niña climate system,

Monday and Tuesday will see cold temperatures around 18 to 19 degrees during the day, falling to single digits at night.

Temperatures will plunge into the single digits by early Sunday, and likely won't rise above the single digits until Wednesday.