Recent forecast models from agencies like the Servicio Meteorológico Nacional point to an overnight low near 13°C in Mexico City on September 29, consistent with late-September climatology at the city's 2,240-meter elevation, where radiational cooling under variable cloud cover typically produces lows of 12–14°C. Persistent moisture and light rain from the monsoon trough may limit clear-sky cooling, while any breaks in cloudiness could allow temperatures to dip toward 10–11°C. Trader consensus remains split between sub-9°C and 18°C+ outcomes because short-range model runs show sensitivity to steering patterns and precipitation timing, with new guidance expected from updated GFS and ECMWF runs in the next 24–48 hours before resolution.