I'm going to make a guess and say that you have a fairly predictable routine and you tend to be aware of the following day's schedule.
Additionally I'm going to guess that some of the activities you might engage in require some degree of fore-thought and planning.

If my guesses are remotely correct it would be easy to see why you would dream about the activities of the following day. It's actually a common occurrence for many people.

For examply, tomorrow I know I will do laundry and drive my son to Aikido. I am also expecting rain tomorrow. Because of these expectations I may dream about rain or driving somewhere familiar or my son and these images would be a product of my forethought of future events.

One need not be a great prognosticator to predict future events. Still, it can feel weird to see the patterns and find how much detail your mind can put into a dream that plays out in your future actions.