Nigels Weather Island
| Porthdinllaen Tide Tables |
| (All times are shown in GMT) |
| Day | Tide | Time | Height | Day | Tide | Time | Height | Day | Tide | Time | Height |
| Sunday | Low | 02:59 | 0.97m | Sunday | High | 08:34 | 4.60m | Sunday | Low | 15:30 | 0.54m |
| Sunday | High | 21:03 | 4.48m | Monday | Low | 03:43 | 0.74m | Monday | High | 09:15 | 4.82m |
| Monday | Low | 16:14 | 0.34m | Monday | High | 21:43 | 4.56m | Tuesday | Low | 04:23 | 0.60m |
| Tuesday | High | 09:55 | 4.92m | Tuesday | Low | 16:55 | 0.28m | Tuesday | High | 22:21 | 4.54m |
| Wednesday | Low | 05:03 | 0.57m | Wednesday | High | 10:34 | 4.91m | Wednesday | Low | 17:35 | 0.36m |
| Wednesday | High | 22:58 | 4.44m | Thursday | Low | 05:42 | 0.65m | Thursday | High | 11:12 | 4.77m |
| Thursday | Low | 18:16 | 0.55m | Thursday | High | 23:37 | 4.28m | Friday | Low | 06:20 | 0.83m |
| Friday | High | 11:50 | 4.55m | Friday | Low | 18:54 | 0.82m | Saturday | High | 00:14 | 4.07m |
| Saturday | Low | 06:59 | 1.10m | Saturday | High | 12:29 | 4.27m | Saturday | Low | 19:33 | 1.15m |
