Harlech
| Dv | Ds | Dg | Dl | Dm | Dc | Dj | Dv | |
|---|---|---|---|---|---|---|---|---|
| Vent |  | | | | | | | |
| Direcció | | | | | | | | |
| Mitjana (kn) | 18 | 22 | 30 | 19 | 11 | 9 | 25 | 23 |
| Ràfega (kn) | 27 | 27 | 38 | 26 | 16 | 10 | 35 | 26 |
| Onades | | | | | | | | |
| Direcció | | | | | | | | |
| Alçada (m) | 1.1 | 1.6 | 2.2 | 1.5 | 0.7 | 0.8 | 1.1 | 1.1 |
| Període (s) | 6 | 6 | 8 | 6 | 4 | 5 | 5 | 5 |
| Temp. | 9 | 6 | 8 | 8 | 10 | 10 | 9 | 6 |
| Núvols | 68 | 100 | 69 | 99 | 100 | 100 | 12 | |
| Pluja | 0.9 | 3 | 0.3 | 0.1 | 4.3 | 0.4 |