Harlech
| Ma | Me | Je | Ve | Sa | Di | Lu | Ma | |
|---|---|---|---|---|---|---|---|---|
| Vent |  | | | | | | | |
| Direction | | | | | | | | |
| Moyenne (kn) | 17 | 4 | 28 | 41 | 27 | 24 | 41 | 38 |
| Rafales (kn) | 21 | 5 | 34 | 58 | 29 | 35 | 57 | 50 |
| Vagues | | | | | | | | |
| Direction | | | | | | | | |
| Hauteur (m) | 0.9 | 0.3 | 1.9 | 3 | 1.4 | 1.5 | 2 | 2.8 |
| Période (s) | 5 | 15 | 7 | 13 | 12 | 11 | 18 | 17 |
| Temp. | 7 | 7 | 8 | 8 | 6 | 7 | 9 | 9 |
| Nuages | 100 | 52 | 100 | 70 | 100 | 100 | 100 | 91 |
| Pluie | 1.8 | 2.6 | 1.1 | 0.8 | 0.1 | 3.5 | 0.9 |