Mine are ok, they just find themselves a shady spot.
I have a cottoneaster , a weeping one, it looks like an igloo, they favour under there in the hot weather.
Mine is a real sun worshipper. These last few weeks is like his birthday and xmas come together.
And a cat I had many years ago would follow the sun round the garden throughout the day. You could nearly tell the time by where she was sleeping at that moment. She really loved that hot one in '84.