National Network of Regional Coastal Monitoring Programmes
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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
Average values for 2025
| Month | Hs (m) | Tp (s) | Tz (s) | Dirp (degrees) | TSea (degrees C) |
|---|---|---|---|---|---|
| January | 2.03 | 12 | 6.7 | 229 | 10.6 |
| February | 1.65 | 12.4 | 6.4 | 233 | 9.9 |
| March | 0.8 | 11.5 | 5.9 | 232 | 10.2 |
| April | 0.84 | 10.6 | 5.3 | 229 | 11.5 |
| May | 0.62 | 10.7 | 5.2 | 224 | 14 |
| June | 0.86 | 8.8 | 4.7 | 228 | 15.2 |
| July | 0.76 | 8.7 | 4.9 | 232 | 16.1 |
| August | 0.83 | 9.8 | 5 | 228 | 17.5 |
| September | 1.33 | 10.1 | 5.5 | 231 | 15.8 |
| October | 1.19 | 9.7 | 5.1 | 232 | 14.6 |
| November | 1.63 | 10.3 | 5.6 | 229 | 13.3 |
| December | 2.95 | 11.9 | 6.6 | 230 | 12 |
