Saint-Cast
| Mo | Tu | We | Th | Fr | Sa | Su | Mo | |
|---|---|---|---|---|---|---|---|---|
| Wind |  | | | | | | | |
| Direction | | | | | | | | |
| Average (kn) | 6 | 7 | 10 | 6 | 7 | 9 | 9 | 14 |
| Gust (kn) | 6 | 9 | 14 | 11 | 9 | 11 | 10 | 18 |
| Waves | | | | | | | | |
| Direction | | | | | | | | |
| Height (m) | 0.6 | 0.4 | 0.6 | 0.8 | 0.8 | 0.6 | 1.2 | 1.4 |
| Period (s) | 9 | 9 | 8 | 14 | 13 | 11 | 10 | 9 |
| Temp. | 18 | 13 | 23 | 21 | 20 | 19 | 17 | 19 |
| Clouds | 26 | 62 | 47 | 99 | 17 | 55 | ||
| Rain | 0.1 |