Conditions at Rosa in May
May: Long Periods and Strong Offshore Potential
May is one of the standout months at Rosa. The average wave period jumps to 9.6s, the highest of the year alongside June, while the average swell height remains a clean 4-5ft (1.3m). The direction mix tilts south and southeast: SSE (19%), SE (17%), S (16%) and ESE (17%), with E (14%) and ENE (10%) also in the mix. This is real winter groundswell starting to roll in, and the fraction of 1.5-2m (5-6ft) and 2-2.5m (6-8ft) waves grows noticeably, especially from the S and SSE.
The wind picture is the best yet. Ideal conditions hit 51%, with SSW (11%), SW (13%) and NNW (8%) becoming significant players, and NNE (19%) no longer dominating the rose. When the W/NW offshore flow kicks in, the southeast-facing sandbars at Rosa set up with real shape and power. Water temperature drops to 21.2°C, air averages 17.9°C, and rainfall is a modest 3.85 mm/day. May is prime time.
Average Spot conditions at Rosa in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at 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 Rosa for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at 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 Rosa.