Seasonal and diurnal variations in the Integrated Multi-satellite Retrievals for Global Precipitation Measurement (IMERG) version 06B final run and TRMM Multi-satellite Precipitation Analysis (TMPA) 3B42 products were accessed from April 2014 to March 2019. Systematic annual mean differences between IMERG and TMPA data over the oceans were smaller for IMERG version 06B than for earlier IMERG versions, possibly because of updated calibration processes. The mean differences between the IMERG version 06B and TMPA data for tropical oceans were relatively small, but differences between two datasets for the tropical Pacific for all four seasons were not. The diurnal amplitude of the IMERG was smaller than that of the TMPA over most continents, and the differences increased with mean diurnal amplitude. The diurnal amplitude of the IMERG were larger than that of the TMPA data over the oceans. The differences between the phases of the precipitation diurnal harmonics in the IMERG and TMPA datasets varied widely in all four seasons, but the mean phases were almost the same over both the oceans and the land. The sources of the differences in diurnal precipitation amplitudes in the Bay of Bengal and along the west coast of Central America, which showed large diurnal ranges and rather different diur-nal amplitudes, were assessed. Differences in seasonal means caused differences in diurnal amplitudes in the Bay of Bengal, but for Central America differences in diurnal amplitudes were associated with seasonal mean diurnal amplitudes.