I used to try to follow the conventional wisdom to weigh once a week. But I always "cheated" and checked a few times during the week and felt guilty about that, like I was doing something wrong. One thing that has been great for me about 3fc was seeing lots of VERY successful losers and maintainers who were daily weighers, which allowed me to give myself permission to weigh daily. I even started a thread this month to track daily weight, which is something I've NEVER done before, and couldn't even imagine doing.
So I absolutely do not thing it's wrong to weigh daily. BUT the issue is whether it works for you personally, to keep you motivated and on plan. If you get upset by seeing NORMAL fluctuations, and maybe even find yourself thinking it's not worth the effort to stay on plan, then definitely stop weighing so frequently. But if that's not the case, and if tracking weight daily helps you want to work to meet your goals, then I don't think there is anything wrong with that.