Interlagos's unpredictable spring weather, with frequent heavy showers and standing water that trigger aquaplaning or visibility issues, creates a near-even chance of a red flag at the 2026 Brazilian Grand Prix. Recent sprint sessions have already produced multi-car incidents on damp surfaces, while official warnings highlight risks of intense rain and winds around the November weekend. New 2026 power-unit restrictions in wet conditions and stricter chassis safety standards add variables that could either limit or prolong disruptions. Trader consensus at 54.5% for no red flag reflects this balance between the circuit's proven disruption potential and the possibility of drier or better-managed sessions.