Most researchers agree that it's best to weigh yourself first thing in the morning. That way, you're more likely to make it a habit and be consistent with it. Weighing yourself in the morning helps especially with age-related gains, which can be more difficult to control.
When should I check my daily weight?
Your weight can fluctuate throughout the day based on many factors, such as hydration, what you eat, and hormones. Thus, it's best to weigh yourself first thing in the morning. As you measure your progress, you'll also find that you get more accurate results by weighing yourself at the same time each day, too.
Do you weigh more in the morning or at night?
If you weigh yourself at night, you're going to weigh more than you actually do, according to Discover Good Nutrition. Weigh yourself first thing the mornings, after your body has had a full night to digest your food. Otherwise, you'll be seeing higher numbers that don't correlate to all of your hard work.