maintenance and weight fluctuation

I have hit my goal weight a while ago and now I'm trying to simply maintain my weight without gaining back the lbs that I just lost. I know that your weight fluctuates depending on the hormonal change, water retention, etc, but how much weight fluctuation do you allow before you begin to think that you have actually gained weight again? I know that this must be different for everybody, but I was just curious... I don't know if I should aim for +/- 3 lbs or +/- 5 lbs... 

Whatever feels best to you, popochi.  Once I get to my goal weight I plan to keep my range +/- 5 lbs, just because I know on the weekends I'll overdo it a bit and I gain during "that time".  If it starts going above that 5th pound I know I'd better start looking at what I'm eating again, and my activity level. 

For me it's harder during the summer when the kids are home from school, and the family wants to go out for ice cream after dinner...aaagh!

Listen to your body, and go more by how your clothes fit than what the number on the scale is.  Stay active, and keep track of your calories for about 3 weeks after you've hit your goal weight (you said "a while ago" but I don't know how long that is in real time :) ).  You should be able to maintain at a higher calorie level if you keep the same level of activity. 

Good luck!

I was just wondering this myself!  I've been hanging out between 121.5 and 123.5.  My chart looks like a zigzag!  Is this still considered "maintaining"? 

My goal had been 120 but the closest I got was 121.4 before this kind of plateau started.  I'm fine with that because 1.4 pounds (or 3.5 pounds) isn't going to make a difference on my frame. 

What do other people fluctuate in maintenance?