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Conditions at Middleton in May
May: The Cold Season Weaponizes
May is a standout month at Middleton. The average period reaches its winter peak of 12.4s, and the swell direction achieves a perfect SSW (40.0%) / SW (42.9%) balance that feeds the south-facing beach both pure south lines and westerly-inflected groundswell from the Bight. Heights are steady and surfable: SW contributes 18.4% in the 1-1.5m (3.3-4.9ft) range and 8.1% at 1.5-2m (4.9-6.6ft), while SSW adds 15.9% and 11.1% respectively. The result is consistently rippable, hollow surf.
The wind picture transforms to match, with ideal offshore flow at 49%. The rose flips to offshore dominance: NNW (12.1%), NNE (9.1%), NW (8.0%) and WNW (7.3%) are now the most frequent directions, and the onshore SSE/S quadrant is pushed down to single-digit percentages. Cold fronts sweeping up from the Southern Ocean are putting Middleton squarely in the sweet spot of the swell window. Water temperature drops to 16.9°C and air averages 14.3°C - grab a proper winter wettie, because this is the beginning of the magic season.
Average Spot conditions at Middleton in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Middleton during May. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Middleton for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Middleton for May. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Middleton.