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Josiahs Bay ratings
Quality on a good day: 4.5
Consistency of Surf: 5.0
Difficulty Level: 2.5
Wind and Kite Surfing: 2.0
Crowds: 3.5

Overall: 3.6

See all 18 ratings

Based on 2 votes. Vote


Surf Report Feed

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

The rose diagram shows only the swells directed at Josiahs Bay that coincided with light winds or offshore conditions through a typical year. It is based on 33220 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours illustrate increasing wave sizes. Blue shows the smallest swells, less that 0.5m (1.5 feet) high. Green and yellow show 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 often that size swell occurs.

The diagram indicates that the most common swell direction, shown by the largest spokes, was NNE, whereas the the dominant wind blows from the E. 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 11% of the time, equivalent to 40 days. Open water swells exceeding >3m (>10ft) only happen 0.2% of the time in a typical year, equivalent to just one day but 2% of the time we expect swell in the range 2-3m (6.5-10ft) 2%, equivalent to (7 days). Taking into account the proportion of these swells that coincided with predicted offshore winds, and given the fact that Josiahs Bay is slightly protected from open water swells, we calculate that clean surf can be found at Josiahs Bay about 11% of the time and that surf is blown out by onshore wind 3% of the time. This is means that we expect 51 days with waves in a typical year, of which 40 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.