The 71st Greater Horn of Africa Climate Outlook Forum (GHACOF71) was held in Nairobi from August 25-26, 2025. The forum was organised by the IGAD Climate Prediction and Applications Centre (ICPAC) in collaboration with the National Meteorological and Hydrological Services (NMHSs) across the Greater Horn of Africa, the World Meteorological Organisation (WMO), and international partners. The forum reviewed and documented the progress and impacts of the June to September (JJAS) 2025 season, released the consolidated objective regional and climate outlook for the October-December (OND) 2025 season, discussed the implications of the OND 2025 climate forecast, and developed practical advice for managing climate risks in various climate-sensitive sectors.