i'm assuming this is an obvious answer but. Is it possible that the advertisers in your market have figured out that their target audience browses the internet more heavily on the weekends? If this is the case I'm sure there are more people in the auction for your placement which in turn will drive the cpc up man... I wish I could get 3 dollar clicks on any day of the week. or 1$ for that matter.
I think Motter is right. You probably have an advertiser that only uses adwords on the weekend and maybe even targets to your site.
Sounds like it to me too. Funny thing is i see alot more traffic on some sites for week days then on weekends. Seems alot of people like using company computers to shop and surf while at work.
Yeah, Motter's probably right. I have a friend who uses Adwords and he advertises heavily on weekends. Other days, not so much.
I dont get $3 clicks on weekends, but usually the clicks are better than what I am paid on weekdays. I have not been able to figure this out especially considering I do about 50% less traffic on weekends.