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

Overall: 3.2

See all 18 ratings

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Surf Report Feed

Zanzibar Swell Statistics, April: Surf with Light or Offshore Winds

This image shows only the swells directed at Zanzibar that coincided with light winds or offshore conditions through a typical April and is based upon 2160 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours show increasing wave sizes. The smallest swells, less than 0.5m (1.5 feet), high are coloured blue. Green and yellow show increasing swell sizes and red represents the highest swells, greater than >3m (>10ft). In either graph, the area of any colour is proportional to how commonly that size swell happens.

The diagram implies that the most common swell direction, shown by the biggest spokes, was N, 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 0.6% of the time, equivalent to 0 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal April. Taking into account the fraction of these swells that coincided with forecast offshore winds, and given the fact that Zanzibar is quite sheltered from open water swells, we calculate that clean surf can be found at Zanzibar about 0.6% of the time and that surf is messed up by onshore wind 0.4% of the time. This is means that we expect 0 days with waves in a typical April, of which 0 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.