It is also going to be relative to your product and/or service. Some sites do extremely well over the weekend, some don't. If you are promoting a brick and mortar business with normal business hours, expect your weekend traffic to decline. If you are promoting something for kids, expect weekend traffic to be on the upward scale.
Much more variance via hours than i expected. early working hour mornings when i expected people to be on the web at least checking email (and hoepfully distracted enough to make a search) is much lower than expected.
It seems that peak hours are late lunch times but only slow deterioration from there-on, with evenings seeming to have a substantive level of activity showing a substantive number of liesure time users
Japananese seem to be more 24 a day people, with good numbers till surfing at midnight and the wee early morning areas.
I guess we never realised how few surfed at midnight from the US and other places as our own server logs are influenced by a very international readership.