The timing of the "lowest weight of the day" can vary from person to person, depends on everything from your diet to how you retain and release water retention to the workings of your digestive system (when you're likely to poo).
It's also misleading to try to determine which weight is the "most accurate," because that implies that some of the weights are accurate and some are not... they all are accurate but they don't necessarily reflect only body fat. The weight on the scale will be affected by water retention and the weight of undigested food and food waste in the body, you can't separate those factors.
You (and all of us) don't have a "true weight," we have a weight range. Fluctuations aren't inaccuracies or anomalies, they're just part of our "real weight," which is a range, not a number.
Since we want to measure pounds lost (and we're really wanting to lose fat and excess water, not muscle and necessary water), we want to be able to say we've lost x number of pounds, not x-y number of pounds. But really that's the fault of the human mind, not a fault of the body.
I think it's important to remember that because otherwise you drink a glass of water, get on the scale and think "Oh my God, I gained a pound, what have I done wrong?"
It doesn't matter when you weigh, as long as you're comparing the weight to weights taken under similar circumstances, and you not stress over normal fluctations (so you need to know what your normal is, when it comes to fluctuations).
For me, my normal fluctation is about 5 lbs, and my PMS/TOM fluctation is almost twice that. Since I'm a daily weigher, that would cause me some terrible stress if I expected to see no variation, or if I thought that being up 3-5 lbs meant I was gaining or failing to lose weight.
Since I know the fluctations are normal, I have to compare my weight not day-to-day, and even not week-to-week, but for sanity's sake, and because I'm a slow loser, I have to compare today's weight to last month's weight.
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