Working Weekends

Is it true that, no matter what, if you work full time Monday to Friday, the weekdays will always be glorious and the weekends rainsoaked disasters? Is it because people are planning to go camping, sailing, golfing, etc that the sky decides to open? Is it because your girlfriend calls you from the beach on Tuesday at three in the afternoon to tell you that it's sooo hot out. Is it just random happenstance.

Am I out of my mind on this one?

James make sure you bring your pancho Oliver