**Current forecasts for Buenos Aires on September 6, 2026, show a cool early-spring night with a minimum air temperature likely between roughly 2–7°C, though model spreads and measurement details create notable uncertainty around the exact low.** Clear skies and a high-pressure system are allowing strong radiational cooling overnight after a brisk south-to-southwest flow on September 5 advected cooler, dry air into the region. This setup favors the lowest temperatures occurring just before dawn under light winds, when surface heat loss is maximized. Official sources (including hourly guidance from Yr and Met Office-style outlooks) point to overnight lows in the 2–4°C range at many sites, with some guidance as high as 7°C if mixing persists or if a slight warm advection arrives earlier. The closely bunched market probabilities around –1°C to 2°C versus higher outcomes (such as 8°C+) reflect genuine forecast divergence: small differences in predicted wind speed or direction can alter boundary-layer mixing and the precise timing of the minimum, while urban heat-island effects at the official station versus suburban sites add further variability. Dry conditions and near-zero precipitation risk reduce the chance of moderating cloud cover or fog. Traders are therefore weighting the balance between continued cold-air advection and any late-model warming signals, with new 00Z–12Z runs and official Servicio Meteorológico Nacional updates expected to narrow the range before the day ends. Historical September minima in Buenos Aires average near 9°C, so this event sits well below climatology and heightens sensitivity to the final observed reading.