National Network of Regional Coastal Monitoring Programmes
« Dychwelid at fap am donau, llanw a gorsafoedd tywydd eraill.
Note that these are real-time data and are not quality-controlled. Long-range graphs are plotted from a randomised subsample of half-hourly data.
Second Severn Crossing
Tide Levels and HarmonicsData llanw diweddaraf (Predicted Tide Table)
| Amser (ASG) | Codiad | Gweddill |
|---|---|---|
| 16-05-2026 08:50 | 8.8 | -0.18 |
| Penllanw nesaf | Distyll nesaf |
|---|---|
| 18:58, 13.65 | 13:23, 0.93 |
| Dyddiad | Uchaf 2026 | Dyddiad | Isaf 2026 |
|---|---|---|---|
| 04-02 | 14.02m | 21-03 | 0.33m |
Second Severn Crossing Predicted Tide Table (Chart Datum)
| 16-05-2026 | 17-05-2026 | 18-05-2026 | ||||||
|---|---|---|---|---|---|---|---|---|
| Time (GMT) | Height | Time (GMT) | Height | Time (GMT) | Height | |||
| High | 06:36 18:58 | 13.39m 13.65m | High | 07:23 19:43 | 13.66m 13.77m | High | 08:10 20:28 | 13.55m 13.53m |
| Low | 00:59 13:23 | 1.28m 0.93m | Low | 01:49 14:11 | 0.80m 0.69m | Low | 02:35 14:56 | 0.67m 0.78m |
| 19-05-2026 | 20-05-2026 | 21-05-2026 | ||||||
| Time (GMT) | Height | Time (GMT) | Height | Time (GMT) | Height | |||
| High | 08:55 21:12 | 13.13m 13.03m | High | 09:41 21:58 | 12.53m 12.43m | High | 10:29 22:47 | 11.88m 11.83m |
| Low | 03:19 15:38 | 0.86m 1.15m | Low | 04:02 16:19 | 1.29m 1.69m | Low | 04:45 17:01 | 1.83m 2.26m |
