Here's a pic

It's called heat and drought :-) Some trees react more severely than others.

Unless that color change is also accompanied by dry, crisp foliage (can't see at that distance), I'm not sure you have a lot to wrry about. If the drought persists, a few deep waterings should help.

Thank you! That is the answer I was hoping for. The leaves do not look dry and crisp and they are not falling. Thanks for responding.