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UK Tidal API

Tidal predictions from the UK's largest authoritative network of tidal stations


​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Access tidal predictions for the UK coastline, built using accurate and reliable data from the country's largest network of tidal stations.

The UK Tidal API (Application Programming Interface) allows you to:

  • Get predictions of high tide and low tide times for today and up to six days in advance from the UK Hydrographic Office's (UKHO) tidal database. This can help you to build applications that give the ​public and businesses a clear outlook of coastal conditions in the UK.

  • Locate over 600 permanent and temporary tide stations around the UK​. These include over 40 stations in the Environment Agency's UK National Tidal Network, and many more managed by Port Authorities.

  • Retrieve up to 10 requests per second and 10,000 requests per month from the UKHO's tidal database at no cost.

How to get the API

Get free access by simply signing up ​to the ADMIRALTY API Developer Portal​. This portal also contains documentation and ​code snippets​ to help you get the best out of the UK Tidal API.

Access the ADMIRALTY API​ Developer Portal >​​

About our data

The UK Hydrographic Office is a leading centre for hydrography, providing marine geospatial data to inform maritime decisions. We work with a wide range of data suppliers and partners to support maritime navigation, safety, security and marine development around the UK and worldwide.

​We make location-based information available through ADMIRALTY Maritime Data Solutions, our world-leading range of charts, publications and custom data sets.

Find out more about the UKHO >​​

Quick guide to UK Tidal API features

Below we've included some key information you may need to know before you get started. You can get full documentation, including code snippets, on the ADMIRALTY API Developer Portal.

Access the Developer Portal here >

​​Feature​​​ ​What the ​UK Tidal API offers

​Output Formats


Data ​Set Update Frequency

​Every 12 months

Coverage United Kingdom

​Usage Limits

​10 requests per second, 10,000 requests per month

Terms of Use for API access​

Access to and usage of our UK Tidal API is subject to conditions set out our Terms of Use document. This important document includes details on ownership and service availability.

Download our Terms of Use​ 

Contact us

If you have any additional queries or need further support, please contact the team at