We have a small 15m by 15m garden here in Kuwait (we have a similar climate to Egypt if not a little more hot). To keep planting all year long, we run a “protect from insects” fine mesh over the entire garden and it feels significantly cooler while still allowing sunlight through. Not scientific enough, but we never thought to check the temperature drop or the sunlight reduction. I may do that this summer just to see how much light is blocked.