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Conditions at Santa Rosa in May
May: Southern Winter Groundswell Ramps Up
The Southern Hemisphere winter machine begins feeding in earnest in May, lifting average swell height to 1.8m (5.9ft) while the period remains a solid 13.6s. The SSW direction remains the dominant conveyor belt at 84%, and the waves carry serious heft: nearly 20% sit in the 2-2.5m (6.5-8ft) class, with the bulk rolling through the 5-6.5ft (1.5-2m) range. Unfortunately, ideal wind drops to 0%. A strong S/SSW coastal flow, 10-20kph, dominates the daylight hours and tends to shred the faces. Rain remains essentially absent, air temps cool to 18.6C and water temps drop to 17.0C. This is a heavy-water month for the experienced crew, with the rare morning glass-off the only ticket to truly good waves.
Average Spot conditions at Santa Rosa in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Santa Rosa 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 Santa Rosa for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Santa Rosa 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 Santa Rosa.