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 Harmonics

  

Live water level data (OD) Data (GMT) (updated every 5 seconds)

This one-second stream of data to the website is experimental and is being developed in conjunction with Fugro GB Limited

Data Ton Ddiweddaraf

Data Ton Ddiweddaraf
Amser (ASG)10-03-2026 21:00
Lledred-
Hydred-
Uchder ton (m)0.25
Uchder uchaf ton (m)0.47
Tbrig (s)3
Tz (s)2
Cyfeiriad mwyaf cyffredin (gradd)-
Ymlediad (gradd)-
Tymheredd y môr (°C)-
Energy Period (s)-
Wave Power (kW/m)-

Data llanw diweddaraf

Data Llanw Diweddaraf
Amser (ASG)10-03-2026 21:30
Codiad9.61
Gweddill0.27
Penllanw nesaf23:12, 10.65
Distyll nesaf05:32, 2.86
Highest Date04-02-2026
Highest Value14.02m
Lowest Date06-03-2026
Lowest Value0.49m