Prupose: to analyze the effects of outdoor work under high-temperature conditions on dehydration in temporary agricultural workers in the Mediterranean region,specifically focusing on sodium and potassium loss and their relationship with sweat loss and other health variables such as weight and blood pressure, while considering individual physiological variability. There is a document containing the results of the temporary workers’ responses. The collected data include sociodemographic information, as well as measurements of weight, heart rate, blood pressure, body temperature, sweat loss, and sodium and potassium loss, taken before, during, and after the workday over nine consecutive days.