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Rate Unawatuna


Surf Report Feed

Unawatuna Swell Statistics, All Year: Surf with Light or Offshore Winds

This image shows only the swells directed at Unawatuna that coincided with light winds or offshore conditions through a typical year. It is based on 34628 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours represent increasing wave sizes. Very small swells of less than 0.5m (1.5 feet) high are shown in blue. Green and yellow show increasing swell sizes and biggest swells greater than >3m (>10ft) are shown in red. In each graph, the area of any colour is proportional to how commonly that size swell happens.

The diagram implies that the dominant swell direction, shown by the biggest spokes, was SSW, whereas the the prevailing wind blows from the W. 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 36% of the time, equivalent to 131 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal year but 17% of the time we expect swell in the range 2-3m (6.5-10ft) 17%, equivalent to (62 days). Taking into account the ratio of these swells that coincided with predicted offshore winds, and given the fact that Unawatuna is slightly protected from open water swells, we think that that clean surf can be found at Unawatuna about 36% of the time and that surf is spoilt by onshore wind 19% of the time. This is means that we expect 201 days with waves in a typical year, of which 131 days should be clean enough to surf.

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.