Avocado Plants in a Hot Climate?

I have grown three avocado plants from the seed in Saudi Arabia in eastern province. After the plants grew I shifted them outside and now the weather is a little bit cold and varies between 6 and 18 degrees C.

The plants are growing smoothly and quickly as they are in a sandy area in front of my office outdoors under sunshine. My question is what will happen in summer when there is lot of sunshine and hot weather having 48C and humidity 80% and more even?

Hardiness Zone: 11

By moinuddin khawaja from Saudi Arabia (Jubail)