It is best to water your grass in the morning. This best time to water lawn helps prevent disease because it allows the grass blades to dry out before nightfall, when dew forms. If you water at night, dew keeps the blades of grass wet for hours and this can allow fungal diseases like blight or rust to form on your lawn.
When you water your lawn, you should avoid watering too close to the foundation of your house. Water from lawn sprinklers can cause moisture problems on foundations if they are applied too heavily or too frequently. Homes with basements or crawl spaces tend to have a higher risk for this kind of damage. If you notice signs of dampness in these areas, it might be time to reevaluate your watering habits.
Watering your lawn can also help control pests like mosquitoes. Mosquitoes lay their eggs in standing water, so by keeping your lawn well-watered you can help reduce the number of mosquitoes in your yard.