South central Texas is also known for hot, dry summers and the chance of surprise thunderstorms. Something else to think about during this time. Being in a drought we also have and have had the chance for wildfires.
A few things to make it easier is to remember that lots of water will make the day easier. Have plenty on hand for the wedding party and guests the last thing you want is for someone to have heat stroke. Make sure you have an indoor backup plan just in case the outdoor venue will not work. Communicate with members of the family so that vacations or other plans won't interfer with each other.
Summer weddings can be fun, enjoyable and a great success with a little planning on the part of the bride and groom. Always remember ASK for help if you get overwelhmed, people are there to help you out and make your day special.
Many blessings on your day and have a blessed, safe, fun, exciting summer wedding.