grrrkgrrrl
I spent several years in maintenance (or as I refer to it "denial" over losing the rest of what I want to lose).
I cab easily fluctuate 4 to 5lbs in a day on the scale. Heck, weekends definately! as that is my off routine time. But it was the over indulging on the weekends that allowed my weight to slowly creep back on. It is something you have to watch, but not too closely that you don't go nuts.
Since you have a fluctuation, why not try a 7 day rolling average weight instead of a day to day count. If you see a trend for an upward then eat less and work out more to get back on track.
Another tip would be to set an upper limit. For myself, 150lbs is my upper limit. (someday I hope to say its 140, or even 130, but we'll see). So, if I find that my weekly weigh in is above 150, its time for me to get serious and do something to get back on track. I hit 152 and stuck there for a couple weeks, which is why I'm here and getting back on track.
Just remember, foods high in sodium can make you retain water, which will make the scale higher. Length of time between "bathroom" trips can impact the scale, and for me, foods high in sugar and carbs also make me retain water.
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I think if you try to keep yourself to an absolute figure you'll drive yourself 
When you see the top number of your range for 2-3 days, you might want to tighten up your diet until you see the low or mid-range for a couple days. It's all a balancing act.
