Hi,
since Adwors Stats are not reliable for a timely analysis I want to answer you post with reference what shows in my logfiles:
traffic starts around 7:30 in the morning, peaks around noon (everyones lunchbreak) slows down in the afternoon and has an occassional peak in the evening. Things are slower on weekends.
This is valid for both traffic from SE's as well as from adwords (I track that traffic separately).
Traffic patterns in my experience are audience specific. Since my traffic is mostly local (Germany) I only get traffic from people in the same time-zone. If you get traffic from multiple time-zones (US plus maybe UK), the traffic pattern flattens (experienced this with one of my .com sites).
Hope this helps.