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Uluwatu ratings
Quality on a good day: 4.4
Consistency of Surf: 4.2
Difficulty Level: 4.0
Wind and Kite Surfing: 1.0
Crowds: 1.6

Overall: 3.4

See all 18 ratings

Based on 7 votes. Vote


Surf Report Feed

Uluwatu Swell Statistics, September: Surf with Light or Offshore Winds

This image shows only the swells directed at Uluwatu that coincided with light winds or offshore conditions through a typical September. It is based on 2880 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours show increasing wave sizes. The smallest swells, less than 0.5m (1.5 feet), high are coloured blue. Green and yellow illustrate increasing swell sizes and red shows the largest swells, greater than >3m (>10ft). In either graph, the area of any colour is proportional to how often that size swell was forecast.

The diagram indicates that the prevailing swell direction, shown by the biggest spokes, was SSW, whereas the the most common wind blows from the SE. The chart at the bottom shows the same thing but without direction information. For example, swells larger than 1.5 feet (0.5m) coincided with good wind conditions 98% of the time, equivalent to 29 days. Open water swells exceeding >3m (>10ft) only occur 1.9% of the time in a typical September, equivalent to just one day but 62% of the time we expect swell in the range 2-3m (6.5-10ft) 62%, equivalent to (19 days). Taking into account the fraction of these swells that coincided with predicted offshore winds, and given the fact that Uluwatu is exposed to open water swells, we calculate that clean surf can be found at Uluwatu about 98% of the time and that surf is messed up by onshore wind 2.0% of the time. This is means that we expect 30 days with waves in a typical September, of which 29 days should be surfable.

IMPORTANT: Beta version feature! Swell heights are open water values from NWW3. There is no attempt to model near-shore effects. Coastal wave heights will generally be less, especially if the break does not have unobstructed exposure to the open ocean.