Texas Summer Wedding

We had to postpone our wedding due to COVID and family issues from April of this year to sometime next year and I am trying to pick a date that isn't too far away from now but I also still have time to finish planning and change some things. It gets really hot here during spring to summer and we can't do June because of previously planned events. Would July be too hot and I was thinking May because it is almost an exact year from now but I can't decide because both months are very hot in Texas and because my fiances birthday is in May and would it be weird to have it near his birthday. Also, has anyone else done their own flowers? I really don't feel like paying $2,000 to $3,500 for my flowers including centerpieces, bouquets, and boutonnieres and any DIY wedding advice would be appreciated.