Farmers in northern Thailand are increasingly confronted with climate change impacts, such as extended droughts and excessive rainfall in consecutive years. The objective of this paper is to investigate the water-saving potential and monetary benefit of farmers of mangos of different irrigation methods under conditions of more frequent weather abnormalities. Cost-benefit analyses show that an investment in a micro sprinkler system can be recommended. As the marketable yield of fruits can be increased substantially (31% increase in class I fruits larger 300 g) with improved irrigation, especially during a drought year, it is worthwhile to change traditional irrigation into modern, water-efficient, and flexible systems.