Continuous seismic waveforms from a temporary network of 10 seismometers deployed around the United Downs Geothermal Project, Cornwall, between 2019 and 2021 as part of the NERC funded GWATT project. Data were recorded on Guralp CMG3-ESP broadband seismometers and digitised with a sample rate of 200 Hz. Raw data are stored in miniSEED format (https://ds.iris.edu/ds/nodes/dmc/data/formats/miniseed/). Metadata that allows the raw data to be converted to ground motions, as well as the location of the stations are stored in StationXML format (https://docs.fdsn.org/projects/stationxml/en/latest/overview.html). Both raw data and metadata are available from the UK node of the European Integrated Data Archive (https://eida.bgs.ac.uk) using standard FDSN webservices (https://www.fdsn.org/webservices/). Further details about the network are available at https://www.fdsn.org/networks/detail/9U_2019/. The DOI for this data set is https://doi.org/10.7914/hpf0-6r63.