Aim for 1-2 inches of weekly rainfall when deeply and seldom watering your lawn. To limit evaporation and prevent watering during the warmest part of the day, water in the morning. Step on the grass to do a fast test; if it swiftly bounces back, it is sound. If not, watering is necessary. Keep in mind that overwatering may be just as damaging as underwatering, so be careful and modify your schedule as necessary.