Centipede grass should be watered deeply and infrequently. It is recommended to water centipede grass once a week, providing at least 1 inch of water. The best time to water is early in the morning to allow the grass to absorb the moisture before the heat of the day. Avoid watering at night to prevent fungal growth. It is important to allow the soil to dry out slightly between waterings as overwatering can lead to root rot and other issues.