monday to friday are the best performing days for me. weekend usually people tend to go party or sleeping at home or go outing with family friends together.
I just compiled all my stats in excel and broke them down... It seems that Saturday and Sunday are the highest by far. (This is expected for my niche). But in terms of the weekdays, Wednesday and Thursday are by far the lowest earners, and have the lowest ECPMs.... I dont like the looks of these stats.. Im glad i read this post, this is the first time i have actually broken down my stats and analyzed.
I think it will be all for naught, though. Different sites WILL perform differently on different days so an overall average would probably tell you less. I have some web sites (no adsense on them) that have a very cyclical traffic pattern with the weekends being very low compared to weekdays. It all does depend upon the audience for the particular site.
Weekdays are definatley best for me. I hate Saturdays and Sundays! Recently we had bad snow over here and that helped me as everyone was sat at their computers all day!
Well, you might not like it, but franktwin is partly right - it depends most on your TOPIC, perhaps he meant that with "content". If your site is about pets you might get most visitors and earnings on weekends. If you run a business blog (what I do), weekends are the worst days and Tuesday is best. I'm pretty sure there's no real general BEST day of the week - just one for each topic. And: the more traffic, the higher earnings, no matter when.
I find that the revenue chart goes somewhat like a wave. For example, if it's high on monday, tuesday, it will slowly crawl down until friday reaching its low point, then slowly go back up until it hits another high on monday or tuesday. But this "wave" effect keeps changing depending on how the wave is moving so I think it's not so predictable. But yes, usually, monday and tuesday is the best days for me and near thursday and friday are the worst as people are ready to get off work and party I think.