Maize is a staple crop widely required by the community for daily activities, yet the high demand is not matched by increased production. The production of maize in Sumenep Regency and Malang Regency has experienced fluctuations from 2017 to 2020. These fluctuations in maize production are due to climate change, which can affect the water requirements of maize plants. Future climate conditions can be predicted using climate projection scenarios, which can be utilized with a water balance. This study aims to analyze the water balance to determine the water requirements of maize based on climate projection scenarios. The research was conducted from April to August 2023 in Sumenep Regency and Malang Regency. The materials used include average rainfall data and average temperature data from 1991-2020 from BMKG, historical data from 1991-2005, projection model data from CNRM-CM5, GFDL-ESM2M, and CSIRO MK 3.6 for 2026-2050, field capacity data, and permanent wilting point data. The research locations were determined using the purposive sampling method. Data analysis was conducted using descriptive statistical analysis and water balance analysis. The water balance analysis in this study used the Thornthwaite and Mather method. The results of this study indicate that the water requirements for maize in Sumenep Regency and Malang Regency will increase during the 2026-2050 period. Sumenep Regency is projected to experience an increase of 1.4-2.2 liters/m²/decade, while Malang Regency is projected to see an increase of 8.9-11.8 liters/m²/decade..