Market-implied odds for Mexico City's October 1 minimum temperature remain tightly balanced, with 9°C or below and 19°C or higher each at 48% alongside 30-32% for mid-range values like 14°C, reflecting substantial short-range forecast uncertainty. At 2,240 meters elevation in the Valley of Mexico, nocturnal radiative cooling under variable cloud cover and light winds from recent southerly flow will largely determine the outcome, as lingering early-October moisture and possible showers can suppress or enhance temperature drops. Current conditions show daytime highs near 22-25°C with overnight lows in the mid-teens, consistent with seasonal baselines, yet model spreads on steering patterns and precipitation timing create the even trader consensus. Official Servicio Meteorológico Nacional updates and refined ensemble runs over the next 48 hours represent key catalysts that could shift probabilities ahead of resolution.