You may think your lawn needs watered every day, but it doesn't. The goal is actually to water your lawn as infrequently as possible while making sure the root zone is getting moisture on a consistent basis. It sounds complicated, but it isn't! 

You don't need to water your yard daily. Frequent, superficial watering causes plants to produce shallow roots that do not survive heat or dry conditions. Putting a lot of water down at once is a good way to ensure you're not watering too frequently. You just want to ensure that the water is being absorbed. If water is pooling or running off on your driveway or into a ditch, it isn't being absorbed and isn't helping your lawn. 

You also want to keep in mind the local climate. The amount of rainfall and wind in your area will help decide how often the lawn needs water. If you get a lot of rainfall, you won't need to water as much. If you get a lot of wind, you may need to water more since the moisture evaporates faster. 

It is also important to consider what you're putting on or doing to your lawn. For example, your lawn may need more water after applying fertilizer. All fertilizers, organic or other, encourage lawns to feed and grow so they may be a little thirstier during this time. If you thatched or aerated your yard, this will also change your watering needs. When a yard is dethatched or aerated, it can increase water run off so it may seem like your yard doesn't need water, but in reality it does. The water doesn't always reach the soil before it runs off in that situation.