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 | 01:17 | 1.91m | Monday | High | 07:01 | 3.41m | Monday | Low | 13:35 | 1.90m |
| Monday | High | 19:09 | 3.76m | Tuesday | Low | 02:05 | 1.57m | Tuesday | High | 07:43 | 3.67m |
| Tuesday | Low | 14:17 | 1.60m | Tuesday | High | 19:47 | 4.04m | Wednesday | Low | 02:41 | 1.24m |
| Wednesday | High | 08:16 | 3.89m | Wednesday | Low | 14:51 | 1.31m | Wednesday | High | 20:19 | 4.29m |
| Thursday | Low | 03:13 | 0.96m | Thursday | High | 08:45 | 4.08m | Thursday | Low | 15:21 | 1.05m |
| Thursday | High | 20:48 | 4.49m | Friday | Low | 03:43 | 0.74m | Friday | High | 09:11 | 4.24m |
| Friday | Low | 15:50 | 0.83m | Friday | High | 21:19 | 4.65m | Saturday | Low | 04:12 | 0.59m |
| Saturday | High | 09:40 | 4.36m | Saturday | Low | 16:21 | 0.69m | Saturday | High | 21:50 | 4.74m |
| Sunday | Low | 04:43 | 0.50m | Sunday | High | 10:11 | 4.42m | Sunday | Low | 16:54 | 0.64m |
