The UK National Tide Gauge Network is owned and operated by the Environment Agency on behalf of the UK Coastal Flood Forecasting service (a partnership between the Environment Agency, Natural Resources Wales, the Scottish Environment Protection Agency and Northern Ireland Department for Infrastructure – Rivers. It records tidal elevations at 44 locations around the UK coast. Data is made available in near real time with measurements reported every 15 mins. The measurements provide mean sea level within each 15 min window and are reported both relative to local datum (unit m) and relative to the Ordnance Datum at Newlyn (unit mAOD).

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  Defra Tide Gauge API
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  Defra Tide Gauge API Documentation
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