There are a lot of people who usually love to go on vacations during the summertime. There are some states in the US that you are not recommended to visit in the summer because the weather can be incredibly hot and humid. Instead of being grateful for the good weather, you will only become immediately dehydrated and tired.
You are not recommended to go to Louisiana because you can already expect that you will sweat a lot. You are also not recommended to visit Texas in the summer unless you want to feel like you are getting burned because of the heat. Oklahoma may not be the nicest in the summer but you can visit any other time.