Nigels Weather Island
| Porthdinllaen Tide Tables |
| (All times are shown in GMT) |
| Day | Tide | Time | Height | Day | Tide | Time | Height | Day | Tide | Time | Height |
| Friday | High | 02:16 | 3.27m | Friday | Low | 09:18 | 2.26m | Friday | High | 15:01 | 3.45m |
| Friday | Low | 22:16 | 2.03m | Saturday | High | 04:12 | 3.27m | Saturday | Low | 10:58 | 2.21m |
| Saturday | High | 16:39 | 3.60m | Saturday | Low | 23:42 | 1.74m | Sunday | High | 05:38 | 3.57m |
| Sunday | Low | 12:13 | 1.87m | Sunday | High | 17:47 | 3.95m | Monday | Low | 00:44 | 1.28m |
| Monday | High | 06:32 | 3.96m | Monday | Low | 13:07 | 1.43m | Monday | High | 18:38 | 4.36m |
| Tuesday | Low | 01:33 | 0.81m | Tuesday | High | 07:15 | 4.32m | Tuesday | Low | 13:52 | 0.99m |
| Tuesday | High | 19:20 | 4.74m | Wednesday | Low | 02:15 | 0.42m | Wednesday | High | 07:54 | 4.62m |
| Wednesday | Low | 14:32 | 0.61m | Wednesday | High | 20:01 | 5.05m | Thursday | Low | 02:55 | 0.16m |
| Thursday | High | 08:31 | 4.83m | Thursday | Low | 15:12 | 0.35m | Thursday | High | 20:42 | 5.24m |
