They do get some sun in the morning, but are in shade the rest of the day. When I started out everything I read, and a LOT of people told me, put them in FULL sun, except one book said calico shade in the afternoon. When you are trying to catch a swarm, you are told to put the box in the shade.
I did set up my hives in full sun, before I got my bees. Then one day, on a nice hot day, I went out to my hives, man it was SCORCHING. So the next day I moved them to their current location. I am just a hobby keeper, and a brand spanking new one at that, with a whole 4 months under my belt. So remember, what works for someone in a moderate climate may not work for you if you have temperature extreems.
Just figured I'd share my observations.