Buy the 2015 Old Farmer's Almanac!
I wouldn’t be too concernedI wouldn’t be too concerned about the heat as the raised bed will shade the surface beneath, but I would be worried that the solid surface beneath the beds would cause problems with drainage. You would need to either break up or remove the concrete below the bed, or else make gaps in the sides of the bed for water to escape.

Shop Wind Bells in the Almanac General Store