I thought I would do a little experiment during the past week and see just how much my weight fluctuates.
What I did was weigh myself every morning as soon as I got up, after breakfast, after my ride and right before I got into bed each night. The results were quite surprising. Some days I would see up to a 4 pound weight swing.
Yesterday, I weighed 184.5 when I got up, 185.3 after breakfast, 182.7 after my ride, 186 before bed and 187.3 when I got up this morning.
Conclusion: Weighing yourself once a week vs. every day makes a whole lot of sense.