As a little proof that owning small caps can be harmful to your portfolio during the summer. The seasonal trade would be to start looking at buying for the Nov - March period where the summer dogs turn into the winters superstars.
I generally like to start putting together my shopping list in late august or early September and nibble as I see opportunities. My list is generally heavy in small techs with lots of cash and little debt (incase I'm wrong and there's no bounce - which does happen but rarely)
My shopping list this year will be very light on biotech as I'm not seeing many bargains - but there are a few on my radar but still 20%+ away from levels where I would begin to accumulate in any size.