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 | 00:17 | 2.05m | Tuesday | High | 05:53 | 3.47m | Tuesday | Low | 12:50 | 1.58m |
| Tuesday | High | 18:40 | 3.53m | Wednesday | Low | 01:16 | 1.62m | Wednesday | High | 06:48 | 3.86m |
| Wednesday | Low | 13:40 | 1.09m | Wednesday | High | 19:24 | 3.91m | Thursday | Low | 02:01 | 1.16m |
| Thursday | High | 07:29 | 4.26m | Thursday | Low | 14:22 | 0.63m | Thursday | High | 20:00 | 4.26m |
| Friday | Low | 02:39 | 0.72m | Friday | High | 08:07 | 4.64m | Friday | Low | 15:01 | 0.25m |
| Friday | High | 20:36 | 4.54m | Saturday | Low | 03:16 | 0.35m | Saturday | High | 08:45 | 4.95m |
| Saturday | Low | 15:38 | -0.01m | Saturday | High | 21:11 | 4.74m | Sunday | Low | 03:53 | 0.11m |
| Sunday | High | 09:24 | 5.13m | Sunday | Low | 16:17 | -0.11m | Sunday | High | 21:49 | 4.83m |
| Monday | Low | 04:34 | 0.01m | Monday | High | 10:04 | 5.15m | Monday | Low | 16:58 | -0.03m |
