CHICAGO (CBS) -- Another cold front will arrive by evening, bringing a brief shower chance. 

This frontal passage will open the door for a cooler northwest wind tonight and northerly winds tomorrow. 

Temperatures will run below average for at least the next 7 days. The normal high is 79 degrees.

The weekend will feature sunny skies and breezy conditions as a dominant northeasterly wind flow develops. This will create high waves on both Saturday & Sunday, making hazardous boating conditions.

Another cool down is on the way early next week, as rain chances increase late day Monday through Wednesday.

FORECAST

TONIGHT: EVENING SHOWER CHANCE. CLOUDS LINGER. LOW 64.

THURSDAY: MOSTLY CLOUDY. HIGH AROUND 70.

FRIDAY: PARTLY SUNNY. HIGH 72.