Relative to your overall weight, that doesn't seem like it's highly variable, but I've never been much for stats. Try weighing yourself daily after dinner and see the difference.
How much water do you drink per day? I have found that in times where I'm not drinking enough water, my weight will fluctuate more.
Nah, it's not that variable, it just fluctuates a bit. By "it's not as useful" I mean that weight loss/gain happens at larger timescales, so you can't look at normal daily noise and say "omg im so fat".
I think the noise has more to do about the time you last drank water (right before bed, for example), also the time you last ate (the later you eat, the more food you'll still be digesting when weighing yourself). It's not a problem by any stretch, it's just normal data variance.
How much water do you drink per day? I have found that in times where I'm not drinking enough water, my weight will fluctuate more.