 Big Z weather is a service of Alton Auto Butler. Become a member today. Wash every day at one low price. Alton Auto Butler, where every car gets the royal treatment. Tonight, we will have temperatures in the low mid-50s. And in the morning, cloudy skies that will continue throughout the day. A high near 80 degrees on Monday night. We're in the lower 60s. And on Tuesday, we'll wake up to sunshine.