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Climate Impact Company Week 2-to-4 South America Outlook
Issued: Monday December 29, 2025
Headline: Argentina slow to lose wet pattern. East Brazil receives some rain.
Chart of the day: 7-day percent of normal rainfall.
Discussion: The 7-day rainfall observations across South America are aggressively wet in Northern Argentina and Paraguay while East Brazil is extremely dry.
Week-2 Valid January 4-11, 2026: Lingering rain Argentina; Wetter East Brazil.
Discussion: Wet weather lingers in Argentina while much needed rain arrives in East Brazil. Northeast Brazil is the dry and hot zone.
Week-3 Valid January 11-18, 2026: Still wet East Brazil; Drier Argentina.
Discussion: ECM maintains the wet pattern change for East Brazil while trending Northern Argentina drier.
Week-4 Valid January 18-25, 2026: Dry bias ECM for week-4.
Discussion: The week-4 ECM rainfall outlook continues to imply increased dryness and less anomalous wet risk.