Nusa Dua is the rainy-season bread and butter equivalent to Uluwatu. There's always a wave here. Nusa Dua is a swell magnet; in fact, Nusa Dua is known to have the biggest rideable surf in Bali, and much of Indonesia. It can be a beast of a wave. The wicked current and rogue set waves can wash a surfer down the entire reef before he or she even gets a wave. Giant Nusa is a difficult playing field, and surfers should use extreme caution when looking out at what appears to be fun, six to eight-foot waves with nobody out. The distance of the reef from the beach can be deceiving, and often they will find dangerous, 12 to 15-foot conditions.
Source: Nusa Dua Surf Guide