marine.ocean.swell

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Hourly swell forecast at an ocean coordinate — swell wave height (m), swell direction (°), and swell period (s) for up to 16 days. Swell consists of wind-generated waves that have propagated far from their origin, typically with longer periods (>10s) and more regular patterns than wind-sea. High-period swell (>12s) is ideal for surfing; low-period swell (<6s) indicates local chop. Swell direction indicates where the swell is coming from (degrees clockwise from north). Useful for surf forecasting, sailing passage planning, and aquaculture site assessment. Source: Open-Meteo Marine API, CC BY 4.0, no authentication required.