This dataset contains the results of high temperature (up to 600 degrees Celsius) steady-state flow water permeability experiments conducted on samples of lava dome rock from Soufrière Hills Volcano, Montserrat. The dataset includes permeability measurements obtained under laboratory conditions at constant 10MPa confining pressure, 2MPa pore pressure and varying temperature conditions from room temperature up to 600 Degree Celsius. The data were collected, between August 2024 and January 2026, as part of the NERC-funded project NE/W008033/1 The explosivity of volcanic eruptions: Quantifying the critical role of permeability in magmas. Data are provided in Microsoft Excel (.xlsx) format and includes sample information and steady state permeability data for samples from the lava dome of Soufriere Hills volcano at varying temperatures