Here's some photos of my mum's Crepe Myrtle which is blossoming right now, despite the 113 degrees heat! I looked up to post a reference, and found that they do tolerate the heat nicely....
Here's the site and an excerpt:
The crepe myrtle also known as crape myrtle is of the Lagerstroemia species and belongs to the Lythraceae family. This deciduous tree is a favorite in southern gardens blooming most of the summer and tolerating its heat.