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Conditions at Sumner Avenue in April
April: The Wind Turns South
April marks the true spring shift at Sumner Avenue. Average swell height eases to 1.2m (3.9ft) with a period of 7.3s, but the swell direction profile is actually ideal: S (16.9%), E (13.2%), SSE (12.5%), SE (10.5%) and ESE (9.9%) keep the favorable ESE-S window near 50% of all swells. The problem is wind. SSW is now the dominant direction at 13.3%, with S at 8.9% and SW at 8.1%; the offshore N/NW/WNW combo drops to just 22% ideal. As a result, many days that have swell also have onshore or side-shore wind, creating bumpy, less makeable waves. Water temperature climbs to 9.3°C (49°F) and air temps to 10.1°C (50°F), with precipitation averaging 2.98 mm/day. Catch the occasional NW-clearing days for the best waves.
Average Spot conditions at Sumner Avenue in April
Swell history for April
Wind history for April
Swell quality
Analyze the groundswell consistency at Sumner Avenue during April. 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 April.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sumner Avenue for April. 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.