Harlech
| Th | Fr | Sa | Su | Mo | Tu | We | Th | |
|---|---|---|---|---|---|---|---|---|
| Wind |  | | | | | | | |
| Direction | | | | | | | | |
| Average (kn) | 19 | 22 | 9 | 11 | 19 | 20 | 17 | 16 |
| Gust (kn) | 26 | 25 | 11 | 17 | 21 | 23 | 19 | 26 |
| Waves | | | | | | | | |
| Direction | | | | | | | | |
| Height (m) | 1.1 | 1.3 | 0.8 | 0.9 | 1.2 | 1.5 | 1.2 | 1.2 |
| Period (s) | 7 | 7 | 5 | 5 | 5 | 6 | 5 | 7 |
| Temp. | 17 | 15 | 15 | 18 | 16 | 14 | 14 | 17 |
| Clouds | 91 | 100 | 86 | 94 | 90 | 10 | 97 | |
| Rain | 0.2 | 0.1 | 1.1 | 0.6 | 1.5 |