 Big Z weather is a service of Alton Auto Butler. Where every car gets a royal treatment, all you have to do is pull in and let Alton Auto Butler do the rest. For today, sunshine, a high in the upper 80s. Northeast winds at 5 to 10 miles per hour. Tonight, partly cloudy and a low in the upper 60s. Mostly sunny Friday morning, then increasing clouds by afternoon. Slight chance of showers and thunderstorms, a high in the mid-80s. And Saturday, partly sunny, a chance of showers and thunderstorms, a high near 90 degrees. Right now it's sunny and 79.