Why not reach for a brown blazer and jeans? Both items are very comfortable and look cool when paired together. Look at how great this outfit pairs with desert boots. If you're trying to figure out a season-appropriate outfit, this here is your inspiration.
For a safe casual option, you can rely on this combination of a grey blazer and jeans. Desert boots are a great idea to complete your ensemble. There are a multitude of ways to look cool and survive the extremely hot weather, and this here is one of them.