With the weather heating up, grass is going to struggle to stay green.  Make the choice to either commit to watering and keeping it green or letting it go dormant and brown.  If you let your grass go dormant and then decide to water it, you could be harming your lawn.  Breaking dormancy cycles costs the grass a lot of food and energy reserves, and makes it more susceptible to disease.  If you commit to watering and keeping up with it, you can let your lawn go into a mild drought.  If you walk on your lawn and you can see the footprints left behind, that is a sign of mild drought. This is beneficial to the grass because it stimulates root growth.