To be healthy, a lawn needs 2 to 3 cm of water per week. If the weather is very dry and it doesn't rain, watering is necessary.  Prefer less frequent, deep watering rather than short, frequent surface watering. Deep watering promotes the development of a deep, weather-resistant root system. The stronger the roots of your lawn, the more resistant it will be to extreme weather conditions. The best time to water is early in the morning or early in the evening, if municipal regulations permit. Avoid watering in direct sunlight and, if possible, allow time for the lawn to dry before the night to prevent the development of fungal diseases. Always follow your municipality's watering regulations.