CHICAGO - The Chicago area will have mild temperatures overnight, with the thermometer staying in the 30s and low 40s. However, there’s a chance of rain moving through the area, so you might want to keep an umbrella handy if you're heading out late tonight.

Rain is expected to make an appearance in the Chicago area late Saturday night, and like the last few rainy days, fog will develop as well. Sunday morning, Chicago will be dealing with rain and fog, while northwest Indiana will primarily have heavier and more widespread rain.

Tomorrow will stay dry but mostly cloudy. Despite the cloud cover, temperatures will climb into the mid-50s. A weather system passing just south of the region at night could bring some light rain, especially east of Interstate 57. Sunday will remain mild, with highs near 50 degrees and a chance of occasional sunshine.