Yes, it's water tight in a light to heavy rain. The Luxury Pergola's sealing louver system keeps you dry while all the water will rush into the gutters and drain then out of the system. Water Tight does not mean totally waterproof. Because it can open and close, the Luxury Pergola will not keep out the water as well as a traditional roof. Also, the sides of the unit are open, allowing for rain to enter.