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 |
|---|---|---|
| 14-05-2026 22:00 | 3.88 | -0.01 |
| Penllanw nesaf | Distyll nesaf |
|---|---|
| 05:45, 12.74 | 00:04, 2.03 |
| Dyddiad | Uchaf 2026 | Dyddiad | Isaf 2026 |
|---|---|---|---|
| 04-02 | 14.02m | 21-03 | 0.33m |
Second Severn Crossing Predicted Tide Table (Chart Datum)
| 14-05-2026 | 15-05-2026 | 16-05-2026 | ||||||
|---|---|---|---|---|---|---|---|---|
| Time (GMT) | Height | Time (GMT) | Height | Time (GMT) | Height | |||
| High | 04:50 17:18 | 11.84m 12.27m | High | 05:45 18:10 | 12.75m 13.12m | High | 06:36 18:58 | 13.39m 13.65m |
| Low | 11:32 | 2.24m | Low | 00:04 12:31 | 2.03m 1.48m | Low | 00:59 13:23 | 1.28m 0.93m |
| 17-05-2026 | 18-05-2026 | 19-05-2026 | ||||||
| Time (GMT) | Height | Time (GMT) | Height | Time (GMT) | Height | |||
| High | 07:23 19:43 | 13.66m 13.77m | High | 08:10 20:28 | 13.55m 13.53m | High | 08:55 21:12 | 13.13m 13.03m |
| Low | 01:49 14:11 | 0.80m 0.69m | Low | 02:35 14:56 | 0.67m 0.78m | Low | 03:19 15:38 | 0.86m 1.15m |
