Nigels Weather Island
| Porthdinllaen Tide Tables |
| (All times are shown in GMT) |
| Day | Tide | Time | Height | Day | Tide | Time | Height | Day | Tide | Time | Height |
| Wednesday | High | 01:19 | 3.91m | Wednesday | Low | 08:29 | 1.31m | Wednesday | High | 13:57 | 3.58m |
| Wednesday | Low | 20:41 | 1.63m | Thursday | High | 02:13 | 3.82m | Thursday | Low | 09:25 | 1.36m |
| Thursday | High | 14:58 | 3.54m | Thursday | Low | 21:43 | 1.69m | Friday | High | 03:15 | 3.77m |
| Friday | Low | 10:27 | 1.37m | Friday | High | 16:07 | 3.57m | Friday | Low | 22:50 | 1.66m |
| Saturday | High | 04:25 | 3.78m | Saturday | Low | 11:31 | 1.31m | Saturday | High | 17:14 | 3.69m |
| Saturday | Low | 23:54 | 1.52m | Sunday | High | 05:33 | 3.88m | Sunday | Low | 12:31 | 1.19m |
| Sunday | High | 18:13 | 3.89m | Monday | Low | 00:55 | 1.28m | Monday | High | 06:35 | 4.05m |
| Monday | Low | 13:29 | 1.02m | Monday | High | 19:07 | 4.14m | Tuesday | Low | 01:53 | 0.99m |
| Tuesday | High | 07:32 | 4.24m | Tuesday | Low | 14:22 | 0.84m | Tuesday | High | 19:57 | 4.40m |
