Use a grub control: If grubs are an issue, spread a grub-control product that continues to work through the season. The best time to do this is in early June.
Keep mowing: With summer heat, your grass is probably going to slow down a little. During hot, dry periods, it may only need mowing once every two or three weeks (wait for it to grow about 3 inches tall). During cooler, moister weather patterns, mow enough to keep it from getting more than 3 inches tall -- that could be every week or more than once a week.
Watering smarts: If you want to keep your water bills under control, let your grass go dormant during drought. It will become brown, but it will stay alive. When the rains come again, it'll turn green and start growing. If you don't like the look of a brown lawn, select drought-tolerant types such as buffalograss or give your lawn about 1 inch of water a week.