I think mine must! In addition to rain generally being on weekends and my off-Fridays, there were at least two occasions where I needed to drive to work for non-rain-related reasons (probably child pickup/dropoff), and it rained on those days.
One time it was intermittently raining in the afternoon. I rode home on wet and drying streets, had to pop into the store to buy a can of something the wife needed to make dinner, was in for no more than 5 minutes, and when I came out, it was evident I had missed a passing shower!