National Network of Regional Coastal Monitoring Programmes

Note that these are real-time data and are not quality-controlled. Long-range graphs are plotted from a randomised subsample of half-hourly data.

Porthleven

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(i) stands for Iridium

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Sea and Swell Summary for (11/05/2026 14:32 GMT)
Significant Wave Height (m)	0.37
Wave zero up crossing period (Spectrum Tz) (s)	3
Wind Wave Significant Wave Height (m)	0.3
Wind Wave Peak Period (s)	2.2
Wind Wave Peak Period Direction (°)	288
Swell Significant Wave Height (m)	0.22
Swell Peak Period (s)	8.3
Swell Peak Period Direction (°)	222.2
% Swell	35.4