Between 30 and 155 mm of rain could accumulate in Costa Rica's Northern Zone from September 14 to 20, 2026, the highest forecast range among the country's regions. The probability of an extreme event is low, at about 25%, and forecast uncertainty is also low.
Instituto Meteorológico Nacional de Costa Rica (2026)
Instituto Meteorológico Nacional de Costa Rica. (2026). Pronóstico subestacional: válido del 14 de septiembre al 11 de octubre de 2026. https://www.imn.ac.cr/busqueda?_101_assetEntryId=564589&_101_struts_action=%2Fasset_publisher%2Fview_content&_101_type=content&_101_urlTitle=contenido-pronostico-subestacional&p_p_id=101&p_p_lifecycle=0&p_p_mode=view&p_p_state=maximized