The IMN forecasts below-normal rainfall across Costa Rica from October 12 to November 8, 2026; from October 26 the deficit intensifies in the Central Pacific, North Pacific, and Central Valley (North Pacific: 1 to 70 mm per week).
IMN (2026)
Instituto Meteorológico Nacional. (2026, October). Pronóstico subestacional: válido del 12 de octubre al 8 de noviembre de 2026. IMN. https://imn.ac.cr/pronostico-subestacional