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 | 01:03 | 1.45m | Tuesday | High | 06:50 | 3.85m | Tuesday | Low | 13:22 | 1.70m |
| Tuesday | High | 18:52 | 4.12m | Wednesday | Low | 01:48 | 1.24m | Wednesday | High | 07:28 | 4.04m |
| Wednesday | Low | 14:02 | 1.45m | Wednesday | High | 19:29 | 4.29m | Thursday | Low | 02:23 | 1.08m |
| Thursday | High | 07:59 | 4.19m | Thursday | Low | 14:36 | 1.25m | Thursday | High | 20:00 | 4.42m |
| Friday | Low | 02:53 | 0.96m | Friday | High | 08:25 | 4.32m | Friday | Low | 15:06 | 1.09m |
| Friday | High | 20:30 | 4.51m | Saturday | Low | 03:21 | 0.89m | Saturday | High | 08:52 | 4.41m |
| Saturday | Low | 15:34 | 1.00m | Saturday | High | 20:59 | 4.55m | Sunday | Low | 03:48 | 0.87m |
| Sunday | High | 09:18 | 4.46m | Sunday | Low | 16:03 | 0.97m | Sunday | High | 21:29 | 4.53m |
| Monday | Low | 04:16 | 0.92m | Monday | High | 09:46 | 4.47m | Monday | Low | 16:34 | 1.01m |
