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)14-07-2026 16:00
Lledred-
Hydred-
Uchder ton (m)0.16
Uchder uchaf ton (m)0.26
Tbrig (s)6.7
Tz (s)1.8
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)14-07-2026 16:40
Codiad7.66
Gweddill0.42
Penllanw nesaf19:20, 13
Distyll nesaf02:15, 1.42
Highest Date04-02-2026
Highest Value14.02m
Lowest Date21-03-2026
Lowest Value0.33m