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Erosivity is the potential capacity of rainfall to cause soil erosion, causing environmental impacts that degrade the soil. This study aims to estimate the erosivity of rainfall and characterize the hydrological pattern of the Municipality of União dos Palmares, Alagoas. Rainfall data from 2 rainfall stations located in the city of União dos Palmares, Alagoas, were analyzed. Erosivity was evaluated by monthly and annual estimation models, the rainfall erosivity factor (R) and the hydrological pattern of rainfall. The results found that the erosivity presented an annual average Coefficient of Variation (CV) of 55.37. The municipality showed an average erosivity of approximately 3,699.91 MJ mm ha-1 h -1. The model designed by Bertoni & Lombardi Neto (1999) in December showed the highest erosivity 6,184.19 mm ha-1 h-1, while the model designed by Leprun (1981) in November showed the lowest average 2.69 MJ mm ha-1 h -1 over the evaluated years. The equations proposed by Rufino, Biscaia & Herten (1993) and Bertoni & Lombardi Neto (1999), used to estimate the erosivity of rainfall, showed the highest values ​​when determining the erosivity of the municipality's soils. It is necessary to apply techniques that reduce the erosivity factor of the soil, linked to the sustainable management of areas with greater vulnerability.