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 | 06:30 | 1.73m | Monday | High | 11:59 | 3.95m | Monday | Low | 19:00 | 1.75m |
| Tuesday | High | 00:25 | 3.57m | Tuesday | Low | 07:16 | 2.01m | Tuesday | High | 12:49 | 3.73m |
| Tuesday | Low | 19:57 | 1.95m | Wednesday | High | 01:25 | 3.33m | Wednesday | Low | 08:19 | 2.25m |
| Wednesday | High | 13:55 | 3.56m | Wednesday | Low | 21:11 | 2.06m | Thursday | High | 02:54 | 3.21m |
| Thursday | Low | 09:42 | 2.35m | Thursday | High | 15:23 | 3.52m | Thursday | Low | 22:36 | 1.96m |
| Friday | High | 04:32 | 3.33m | Friday | Low | 11:08 | 2.19m | Friday | High | 16:44 | 3.71m |
| Friday | Low | 23:45 | 1.65m | Saturday | High | 05:38 | 3.63m | Saturday | Low | 12:10 | 1.85m |
| Saturday | High | 17:42 | 4.02m | Sunday | Low | 00:39 | 1.27m | Sunday | High | 06:25 | 3.96m |
| Sunday | Low | 12:59 | 1.45m | Sunday | High | 18:29 | 4.36m | Thursday | Low | 01:00 | 0.00m |
