This dataset contains 3 types of files for 12 cities (v.1.0) in Belgium: Typical Meteorological Year Extreme Meteorological Year Heatwave Events These files were produced from simulations of the MAR model forced by the ERA5 reanalyses over the period 1980-2020 but also by 3 ESMs from the CMIP6 database, namely BCC-CSM2-MR, MPI-ESM.1.2, and MIROC6 over the period 1980-2100. The available data for version 1.0 concerns 12 cities in Belgium but may be increased in future versions of this dataset. A detailed description of the methods used has been submitted as an article in the ESSD journal (S. Doutreloup et al., Historical and Future Weather Data for Dynamic Building Simulations in Belgium using the MAR model: Typical & Extreme Meteorological Year and Heatwaves, Earth Syst. Sci. Data, 2021).