Should a lawn be watered every day in summer?

A lawn should generally not be watered every day in summer, as daily light watering encourages shallow roots, increases disease risk, and wastes water, with deep and infrequent watering being better for lawn health. Most lawns need 1 to 1.5 inches of water per week including rainfall, best delivered in 2 to 3 sessions per week rather than daily, so soil soaks 6 to 8 inches deep, encouraging deep root growth that makes grass more drought tolerant and healthy. Daily watering keeps surface constantly wet, promoting fungal diseases like brown patch and shallow roots that dry quickly. Exceptions include newly seeded lawns that need daily light watering to keep seed moist for germination, and extremely hot sandy soils that drain quickly may need more frequent watering. For established lawns, water early morning 2 to 3 times per week for 20 to 30 minutes per zone, adjusting for soil type, with clay needing less frequent but longer, sandy needing more frequent. So avoid daily watering for established lawn in summer.