Rabbits Heat Stroke?

I have a male rabbits and a female rabbit that live outside and they're both housed in separate NIC condos. I was wondering can they die of heat stroke during the summer if their cages are in the shade? They have plenty of water and when its too hot, they run in their mini crates that I left in their condo so they have something to hide in. I left mini pillows and blankets in their crates so they have something to hide under, will they be fine?