Morning is the best time to weigh because you'll be the emptiest you can be of food and water (after you pee of course).
Saturday morning is my weigh in because I have my spike day on saturday/sunday. So weigh in has to be before it.
I never weigh outside of weigh in. I used to be a scale hopper and giving up the scales was the hardest bloody thing I ever did, but its the BEST thing. I had forgotten the excitement of a "blind" weigh in and the joy of losing something.
I was never happy when I lost a pound when I weighed every day because I was seeing it come off so slowly, coming off then going back on throughout the course of the week!