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J-Bay ratings
Quality on a good day: 4.2
Consistency of Surf: 3.7
Difficulty Level: 2.7
Wind and Kite Surfing: 1.0
Crowds: 2.7

Overall: 3.5

See all 18 ratings

Based on 6 votes. Vote


Surf Report Feed

J-Bay Swell Statistics, December: Surf with Light or Offshore Winds

This image shows only the swells directed at J-Bay that coincided with light winds or offshore conditions through a typical December. It is based on 2705 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 illustrate increasing swell sizes and red shows the highest swells, greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how frequently that size swell was forecast.

The diagram suggests that the prevailing swell direction, shown by the longest spokes, was SSW, whereas the the dominant wind blows from the SSE. 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 28% of the time, equivalent to 8 days. Expect open water swells to exceed >3m (>10ft) 5% of the time (2 days). Taking into account the proportion of these swells that coincided with forecast offshore winds, and given the fact that J-Bay is exposed to open water swells, we think that that clean surf can be found at J-Bay about 28% of the time and that surf is messed up by onshore wind 56% of the time. This is means that we expect 25 days with waves in a typical December, of which 8 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.