Nigels Weather Island
| Porthdinllaen Tide Tables |
| (All times are shown in GMT) |
| Day | Tide | Time | Height | Day | Tide | Time | Height | Day | Tide | Time | Height |
| Monday | Low | 03:08 | 0.54m | Monday | High | 08:42 | 4.65m | Monday | Low | 15:25 | 0.62m |
| Monday | High | 20:54 | 4.90m | Tuesday | Low | 03:44 | 0.47m | Tuesday | High | 09:17 | 4.76m |
| Tuesday | Low | 16:03 | 0.54m | Tuesday | High | 21:34 | 4.92m | Wednesday | Low | 04:23 | 0.51m |
| Wednesday | High | 09:55 | 4.78m | Wednesday | Low | 16:46 | 0.57m | Wednesday | High | 22:17 | 4.81m |
| Thursday | Low | 05:07 | 0.69m | Thursday | High | 10:37 | 4.68m | Thursday | Low | 17:34 | 0.72m |
| Thursday | High | 23:05 | 4.57m | Friday | Low | 05:55 | 0.98m | Friday | High | 11:26 | 4.50m |
| Friday | Low | 18:31 | 0.96m | Saturday | High | 00:01 | 4.25m | Saturday | Low | 06:50 | 1.34m |
| Saturday | High | 12:24 | 4.25m | Saturday | Low | 19:36 | 1.23m | Sunday | High | 01:10 | 3.90m |
| Sunday | Low | 07:57 | 1.69m | Sunday | High | 13:35 | 4.02m | Sunday | Low | 20:54 | 1.44m |
