What is up with the crappy weather?

Why does it always become crappy outside on my days off? It seems as if everyday that I can enjoy some needed sun it is crappy outside. For instance, today it is bright sunny and a perfect sun day. I got up early and cleaned the in-laws that way I could enjoy the sun for the day. I had all my work done my 11 AM came home put on my swimming suit and....RAIN! In the middle of placing on my suit, I could hear something outside. I looked out the window and it was pouring. I really hope that it quits soon that way I can enjoy the rest of the day.