 Big Z weather, a service of Alton. Auto Butler, become a member today. Wash every day at one low price. Alton Auto Butler, where every vehicle gets the royal treatment. Today, clouds high near 90. South wind 5 to 10 miles per hour. Cloudy tonight, few showers possible this evening. Then showers and storms likely overnight, low in the middle 70s. Saturday, partly sunny, a chance of showers and storms high around 90 degrees. And then Sunday, sunshine high in the low 80s.