Nigels Weather Island
| Porthdinllaen Tide Tables |
| (All times are shown in GMT) |
| Day | Tide | Time | Height | Day | Tide | Time | Height | Day | Tide | Time | Height |
| Friday | Low | 04:53 | -0.03m | Friday | High | 10:25 | 5.09m | Friday | Low | 17:22 | 0.02m |
| Friday | High | 22:48 | 4.80m | Saturday | Low | 05:40 | 0.13m | Saturday | High | 11:12 | 4.85m |
| Saturday | Low | 18:09 | 0.35m | Saturday | High | 23:34 | 4.57m | Sunday | Low | 06:29 | 0.43m |
| Sunday | High | 12:02 | 4.48m | Sunday | Low | 18:58 | 0.79m | Monday | High | 00:23 | 4.27m |
| Monday | Low | 07:22 | 0.82m | Monday | High | 12:57 | 4.04m | Monday | Low | 19:52 | 1.27m |
| Tuesday | High | 01:18 | 3.93m | Tuesday | Low | 08:24 | 1.24m | Tuesday | High | 14:04 | 3.61m |
| Tuesday | Low | 20:59 | 1.71m | Wednesday | High | 02:27 | 3.62m | Wednesday | Low | 09:42 | 1.57m |
| Wednesday | High | 15:33 | 3.31m | Wednesday | Low | 22:22 | 1.99m | Thursday | High | 03:54 | 3.45m |
| Thursday | Low | 11:09 | 1.69m | Thursday | High | 17:11 | 3.28m | Thursday | Low | 23:44 | 2.00m |
