At the 15u PG World Series about a week ago, I don't think my son's team saw 1 pitcher at 75 or below. I would say at least 90% of the pitchers topped out between low to high 80's. I know some in the tournament were in the 90's. A lefty or two was probably high 70's, with a lethal slider. Nothing crazy on the velocity end from any of them, but they could all spot the ball very well. Rare to see a mistake down the middle. Yes, some cruised high 70's to low/mid 80's, but those kids could really spot the ball also.
It depends on the tournament and how many teams are playing. In the WWBA some of those pitchers throw less than HS average. There it all thins out as the playoffs move on.