Brazil presidential election (Oct 4, 2026) goes to runoff on Oct 25
Hit
✦ AI-generated prediction
Published on 24. September 2026
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Predicted for 4. October 2026
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Based on: Historical Cycle
All available polls show Lula (PT) at 36–44% and Flávio Bolsonaro (PL) at 35–41% — both well short of the absolute majority of 50% of valid votes required for a first-round win. Polymarket gives both candidates a 97% probability of advancing to the runoff; overall win probability: Flávio Bolsonaro 57–61%, Lula 38–42%. Since no third candidate holds a realistic blocking majority, the October 25 runoff is virtually unavoidable. Brazilian electoral law: without an absolute majority in the first round, the winner is determined in a runoff between the top two finishers.
Data basis for this prediction
- Datafolha (September 2026): Lula 39%, Flávio 36% — kein Kandidat über 50% (Al Jazeera, 22.09.2026)
- AtlasIntel (September 2026): Lula 44,1%, Flávio 41,7% (AS/COA Brazil Poll Tracker)
- Polymarket: je 97% Wahrscheinlichkeit für Runoff-Einzug beider Kandidaten (Stand 24.09.2026)
- BTG Pactual/Nexus Runoff-Simulation: Flávio 46% – Lula 45% (statistisches Unentschieden)
Verdict: Hit
[Vorzeitig entschieden] Brasilianische Präsidentschaftswahl ging in Stichwahl: Lula ~48,4 %, Flávio Bolsonaro ~43,2 % – kein Kandidat über 50 %; Stichwahl am 25. Oktober bestätigt (Quellen: Bloomberg Graphics, Americas Quarterly)
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