Wherever you are, if you want your lawn to stay green, you're going to have to water it, particularly in the heat of summer because they tend to brown out, especially here in the North.
As a general rule of thumb, most lawns need an inch of water per week and when it gets hot and dry, generally Mother Nature doesn't provide that. So, you're going to have to get some kind of a sprinkling device - here's an impact head - and go out and add water to your lawn, to augment what Mother Nature gives us. As a general rule, that's an inch of rain per week, so if you do get some rain, say a quarter inch or half an inch, then you really only need to add a half an inch of water. Since water is precious and expensive, you won't want to over-water.
Now, how do you know when you've got a half an inch or an inch or water? Well, once you set your sprinkler up in the lawn, take a coffee can or a Tupperware container, and put it halfway between the sprinkler head in the furthest place that the water throws to. Then watch that can, and when it gets a half an inch or a inch of water, then you'll know it's time to stop, so that you save water.
So, to keep your lawn green, you're going to have to water and you'll want to add enough water to make up Mother Nature's deficit, to make a one inch per week. Those are my tips for watering your lawn.