weigh in daily/ weekly/morning/evening?

I weigh myself first thing in the morning when I get up wearing just my boxers. And I weigh myself last thing in the evening just before crawling into bed, again in just my boxers.

I use a Withings scale that estimates body fat percentage and automatically logs the readings via WiFi. The frequent weighing gives me plenty of data points for plotting a smoothed curve like you see here: https://trendweight.com/u/58f4f9e97f3740/

I've been weighing in daily in the mornings AND even sometimes at night for comparison. For one thing, my weeks went by so slow and the scale was just taunting me when I just weighed in once a week. But by doing this I'm learning so much more about what sodium, drinking extra water and really good workouts can actually do to the scale. Its also teaching me how crazy the numbers on the scale really are and not to take it so personal. For example, just last night I was up 8lbs but knew not to get upset. Then I thought about it and remembered that from Sunday-Monday I did a 5k (plus all the walking to and from the course and the dancing at the end of the course), 50 minutes of zumba, ate out a mexican restaurant and then ate those leftovers.
Thats what works for me. Oh, I'm also thinking about my weight as "low-mid-high" instead of exact. For example, when my husband asks about my progress I say I'm around the high 220's now.

I weigh myself a couple of times a day just for ****s and grins. I've gotten pretty damned good at guessing what its going to be based upon what I've had to eat and drink during the course of the day. Normally I'll be either completely au natural or in my briefs. But like I said, this is for amusement purpsoes only. My official weigh-in is on Saturday mornings at the gym with my trainer so I can't cheat, I can't lie, I have a witness. It is always in pretty much the same thing. gym short, tops and socks. That's it. That is the official number. But even that I don't freak out about. If it doesn't change over a couple of weeks, I might stress, but over a single reading? Nope. Not in the least.

Monday mornings as soon as I wake, tends to be the same sort of time due to alarm clock. Weekly, no clothes. Basically morning as you haven't eaten and your body has had the night to digest, weekly as your weight will fluctuate daily and this could discourage if you see it going up and down from one day to the next.

^^^ This. It's exactly what I do. I do sometimes "peek" mid week if I'm concerned, but generally try to keep it to once a week.

I am a very number-oriented person so I couldn't wait a whole week to find out numbers. I like to weigh myself every morning when I first get up and in the evening right before I go to bed. I'm not 100% religious about it. Sometimes I only weigh once or skip a whole day, but I like seeing the numbers and how they fluctuate. I know that so many small things can drastically change the result so I'm not too concerned over a small gain or even a small loss, I just like seeing the trend over time and how it changes.