Most warm season grasses like Bermuda or Zoysia do well in hot conditions, but if the weather is too dry, then you may see your grass wilting from the tip of the blades. Seeing this, you should water your lawn for two weeks on a daily basis. This should help it recover. Afterward, you should refertilize. If the grass is dead at the root, though, you have no choice but to sod or reseed.