CHICAGO (CBS) -- Hazy sunshine for the rest of the afternoon with highs in the low to mid-70s. In Northwest Indiana, they're still dealing with an Air Quality Alert which remains in effect until midnight.

Tonight, mostly clear and cool with lows in the low to mid-50s.

Mostly sunny and milder Friday with highs in the low 80s, but mid-70s near the lake.

Saturday we're warming back up with a west wind putting everyone in the mid to upper 80s by afternoon - including areas along the lake. Rain chances increase late Saturday night.

A cold front arrives early Sunday morning allowing for widespread rain chances and much cooler weather. Highs on Sunday will only be in the mid to upper 60s.

THIS AFTERNOON: Hazy sunshine. High 74°

TONIGHT: Mostly clear. Low 54°

FRIDAY: Mostly sunny. High 80°

SATURDAY: Mostly cloudy. High 86°