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Castles ratings
Quality on a good day: 2.0
Consistency of Surf: 4.0
Difficulty Level: 1.0
Crowds: 3.0

Overall: 3.0

See all 18 ratings

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Surf Report Feed

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

The rose diagram shows only the swells directed at Castles that coincided with light winds or offshore conditions over a normal September. It is based on 2400 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 red illustrates highest swells greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how often that size swell happens.

The diagram indicates that the dominant swell direction, shown by the longest spokes, was SW, whereas the the dominant wind blows from the S. 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 33% of the time, equivalent to 10 days. Open water swells exceeding >3m (>10ft) only arise 2% of the time in a typical September, equivalent to just one day but 17% of the time we expect swell in the range 2-3m (6.5-10ft) 17%, equivalent to (5 days). Taking into account the proportion of these swells that coincided with predicted offshore winds, and given the fact that Castles is exposed to open water swells, we think that that clean surf can be found at Castles about 33% of the time and that surf is messed up by onshore wind 65% of the time. This is means that we expect 29 days with waves in a typical September, of which 10 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.