Yes, it's completely possible--and normal. For most people, but not all, their lowest weight is in the morning. It's because you've gone all night without eating and without drinking a lot of water.
That's why it's silly to weigh more than once a day.
Weight also can go up and down for no discernible reason from one day to the next. Usually this has to do with water retention or loss.
So some folks like to weigh officially once a week and record that, and watch the trend. It can help avoid freaking out on the scale.
Jay