Nigels Weather Island
| Porthdinllaen Tide Tables |
| (All times are shown in GMT) |
| Day | Tide | Time | Height | Day | Tide | Time | Height | Day | Tide | Time | Height |
| Tuesday | Low | 04:47 | 0.78m | Tuesday | High | 10:13 | 4.51m | Tuesday | Low | 17:00 | 0.89m |
| Tuesday | High | 22:29 | 4.42m | Wednesday | Low | 05:21 | 1.02m | Wednesday | High | 10:45 | 4.37m |
| Wednesday | Low | 17:36 | 1.13m | Wednesday | High | 23:03 | 4.17m | Thursday | Low | 05:56 | 1.31m |
| Thursday | High | 11:19 | 4.19m | Thursday | Low | 18:17 | 1.40m | Thursday | High | 23:41 | 3.89m |
| Friday | Low | 06:34 | 1.63m | Friday | High | 11:58 | 3.97m | Friday | Low | 19:00 | 1.69m |
| Saturday | High | 00:23 | 3.60m | Saturday | Low | 07:17 | 1.96m | Saturday | High | 12:43 | 3.73m |
| Saturday | Low | 19:53 | 1.97m | Sunday | High | 01:19 | 3.30m | Sunday | Low | 08:14 | 2.28m |
| Sunday | High | 13:45 | 3.50m | Sunday | Low | 21:04 | 2.17m | Monday | High | 02:44 | 3.10m |
| Monday | Low | 09:33 | 2.48m | Monday | High | 15:12 | 3.38m | Monday | Low | 22:35 | 2.18m |
