I bought sun shades from Home Depot. They block 85% of the sun. I have set up three sets of Orbit Misters and have them set on a timer. If the day is going to go over 100, I set the start time for when it gets to 90. The timer goes for 4 hours, so if it is still hot when I get home, I run it a bit longer. On days that will go below 90 quickly, I will set it for less than 4 hours.It can and I do not have much natural shade in my yard. temps get to the high ninety's quite frequently according to the monitoring sight my place always feels really hot during those times.
I think my birds do not know what to make of near 100 one day and 60 some odd the next morning.
I make sure they have cool water to drink. When it gets hot I usually bring out a dog dish of cool water a couple of times during the height of the heat
I use sand in the runs so any moisture will not make mud and the mister cools down the air up to 20 degrees. The sun shade and the misters have kept my heat sensitive birds doing well this year and June was much hotter than normal this year.
