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Due to the move of our Meteorological Archival and Retrieval System (MARS) to the new Data Centre in Bologna there will be no or degraded access to public datasets and data in MARS at times between November 2021 and April 2022. Please visit our dedicated data centre migration pages for more information. Thank you for your patience and support during this important move, which will allow exciting scientific developments and overall better service.

What is ECMWF Web API

ECMWF WebAPI is a set of services developed by ECMWF to allow users from the outside to access some internal features and data of the centre. 

In this page you will find explanations, guides and examples showing how to use the different ECMWF WebAPI services.

This external access is limited and managed by the User Profile access (Member State, Commercial customers, ECMWF staff member...). Some of these services are public and some other are restricted to the Archive Access.


Type of userWebBatch download
Authorized userMARS catalogue (Authorization required, browse and download)Access MARS
Commercial user

Archive catalogue (Only browse)

MARS catalogue (Authorization required, browse and download)

Access MARS
Public userPublic DatasetsAccess ECMWF Public Datasets



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