I learned a long time ago fluctuations throughout the day, or even over a few days, don't really mean anything. So there's no use letting myself get depressed, or get my hopes up over meaningless gains and losses.
I used to weigh too much for me, multiple times per day, but I've been able to successfully limit myself to once per day for quite awhile now. Sometimes i know the number may be stressful, but for me its always much more stressful not knowing.
One thing that helped me cut down to once per day weigh ins is where i keep the scale. Its slid under my dresser. I slide it out once while getting ready, then back out of sight it goes!