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Conditions at Sumner Avenue in May
May: Summer Swell, Onshore Problem
May sees the summer swell machine ramping up: S (17.9%), SSE (16.3%), SE (14.5%) and ESE (11.7%) dominate the rose, meaning over 60% of all swells come from the favorable S-SE sector. However, average height has dropped to 1.1m (3.6ft) and period to 7.2s, so these are mostly windswell lines rather than powerful groundswells. The wind regime is now dominated by SSW (14.4%), SW (10.5%) and S (9.5%), with ideal offshore wind at just 24%. Expect soft, lumpy, small waves for much of the month, though the water is warming nicely to 14.2°C (58°F) and air temps average 15.3°C (60°F). Precipitation averages 2.82 mm/day. A longboard or a groveler is the call.
Average Spot conditions at Sumner Avenue in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Sumner Avenue 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 Sumner Avenue for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sumner Avenue 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 Sumner Avenue.