[Image description: an image from the movie Dazed and Confused with text that reads "'This summer is too hot'. Me: 'Have you ever planted trees?' 'No.' Me: 'Be a lot cooler if you did'"
Are you able to give it long soaking waterings, or possibly even shade it for part of the day? We've done this for some of our trees that were really affected by drought conditions two years ago with good results.