what type of turf? now in the south is when you start to see signs of brown patch on fescue. It looks like your lawn is burned in large patches.
I love it this time of year when my lawn turns a nice shade of brown from drought. I push my lawn mower out of sight until October.
I have some info on curing brown spots in in lawns my blog. You can easily do this with natural every day ingredients that you most likely have around your home. I prefer to use these organic methods over chemicals. Hope this helps you. Good Luck!