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 | High | 05:20 | 3.56m | Tuesday | Low | 12:20 | 1.46m | Tuesday | High | 18:03 | 3.53m |
| Wednesday | Low | 00:36 | 1.72m | Wednesday | High | 06:10 | 3.74m | Wednesday | Low | 13:05 | 1.25m |
| Wednesday | High | 18:45 | 3.76m | Thursday | Low | 01:20 | 1.44m | Thursday | High | 06:53 | 3.93m |
| Thursday | Low | 13:45 | 1.05m | Thursday | High | 19:22 | 3.99m | Friday | Low | 02:01 | 1.17m |
| Friday | High | 07:34 | 4.11m | Friday | Low | 14:23 | 0.88m | Friday | High | 19:58 | 4.19m |
| Saturday | Low | 02:40 | 0.93m | Saturday | High | 08:13 | 4.26m | Saturday | Low | 15:02 | 0.75m |
| Saturday | High | 20:35 | 4.37m | Sunday | Low | 03:20 | 0.74m | Sunday | High | 08:53 | 4.37m |
| Sunday | Low | 15:42 | 0.67m | Sunday | High | 21:14 | 4.50m | Monday | Low | 04:03 | 0.60m |
| Monday | High | 09:36 | 4.42m | Monday | Low | 16:24 | 0.67m | Monday | High | 21:55 | 4.57m |
