The paleosols, due to their potential as paleoenvironmental and stratigraphic proxies, are widely used in studies of paleolandscape and paleoclimate reconstructions. As it constitutes one of the main climatic elements, the mapping of precipitation represents an indispensable factor in the determination of climatic conditions. Thus, the article aimed to map the distribution patterns of Maastrichtian paleoprecipitation from the Bauru Basin, Upper Cretaceous of Brazil, through the use of paleosols as proxies, climofunctions, and geostatistical interpolation of data. The results revealed an average of 683 mm for the Brazilian Maastrichtian, confirming the predominance of the semi-arid climate for the Marilia Formation. Maastrichtian paleoprecipitation mapping of the Bauru Basin, using paleosols, climatic functions, and environmental modeling by geostatistical interpolation, showed a sce-nario of favorable rainfall for the development of paleosols with Bk, Bg, Bss, and Bt horizons, reaching consensus with most previous studies on the climate scenario of the Marilia Formation, Late Cretaceous of Brazil.