Processed data for manuscripit about compound heatwave preconditioned-heavy rainfall (HW_HR). This processed observational data are produced based on the in-situ rainfall observations that were collected from the National Meteorological Science Data Center and available at http://www.nmic.cn/en. Since the original WRF output is too large (more than 15 Tb), here WRF data are extracted from the original WRF output and have been post-processed. The WRF data include maximum convective available potential energy (MCAPE), maximum convective inhibition (MCIN), moisture flux convergence at the first five level near the surface, HW_HR rainfall, noHW_HR rainfall, 10 m wind, 2 m air temperature, 2 m relative humidity and surface sensible heat flux.