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Grumari Surf Stats

All swells

(any wind direction)
Grumari.surf.statistics.maySsw.animatedSsw.label.animated

Good Surf

(light / offshore wind)

The figure describes the combination of swells directed at Grumari over a normal May and is based upon 3414 NWW3 model predictions since 2007 (values every 3 hours). The wave model does not forecast surf and wind right at the coastline so we have chosen the most applicable grid node based on what we know about Grumari. In the case of Grumari, the best grid node is 54 km away (34 miles). The rose diagram illustrates the distribution of swell sizes and directions, while the graph at the bottom shows the same thing without direction information. Five colours illustrate increasing wave sizes. Blue shows the smallest swells, less that 0.5m (1.5 feet) high. These were forecast only 20% of the time. Green and yellow illustrate increasing swell sizes and red shows the highest swells, greater than >3m (>10ft). In either graph, the area of any colour is proportional to how commonly that size swell was forecast. The diagram implies that the dominant swell direction, shown by the longest spokes, was S, whereas the the dominant wind blows from the NE. Because the wave model grid is away from the coast, sometimes a strong offshore wind blows largest waves away from Grumari and out to sea. We combine these with the no surf category of the bar chart. To simplify things we don't show these in the rose graph. Because wind determines whether or not waves are good for surfing at Grumari, you can view an alternative image that shows only the swells that were predicted to coincide with glassy or offshore wind conditions. During a typical May, swells large enough to cause clean enough to surf waves at Grumari run for about 80% of the time.

  • Grumari.surf.statistics.januarySsw.animated
  • Grumari.surf.statistics.februarySsw.animated
  • Grumari.surf.statistics.marchSsw.animated
  • Grumari.surf.statistics.aprilSsw.animated
  • Grumari.surf.statistics.maySsw.animated
  • Grumari.surf.statistics.juneSsw.animated
  • Grumari.surf.statistics.julySsw.animated
  • Grumari.surf.statistics.augustSsw.animated
  • Grumari.surf.statistics.septemberSsw.animated
  • Grumari.surf.statistics.octoberSsw.animated
  • Grumari.surf.statistics.novemberSsw.animated
  • Grumari.surf.statistics.decemberSsw.animated

Also see Grumari wind stats

Compare Grumari with another surf break