Understanding the advantage of crop water use in mixed crops over sole cropping is vital in developing optimum water management crop production in the tropical wet-and-dry climate. This study investigated water supply potential for the cultivation of kenaf (Hibiscus cannabinus L.) – maize (Zea mays L.) intercrop in of South-western Nigeria. The phenological stages of each of the crops formed the basis for the investigation. The experiment comprises of two varieties of kenaf (Tainung 1 and Ifeken400), one variety of maize (DMR-LSR-Y) and two planting season (early and late). Selected moisture indices were measured daily and processed into ten-day (dekad) average for the 2007 and 2008 cropping seasons following FAO.