Depends largely on the strain in some cases, but my tents are usually around 80-85 at canopy level and 75-80 on the floor.
Everybody does it differently. I keep sativa strains around 85-90 at the canopy, sometimes into the low 90s and mostly indicas I never let the temp over 85. Just preference. The sativas seem to grow faster when they're hotter and the indicas a little cooler from my experience.