Recent forecast models from agencies like the Met Office and Yr.no indicate Mexico City highs near 23–24°C on October 3, driven by the city’s subtropical highland climate at roughly 2,240 m elevation, where thinner air amplifies daytime heating under partial cloud cover but limits extremes. Lingering moisture from the fading rainy season supports scattered showers and higher humidity that moderate peak temperatures through evaporative cooling and reduced insolation. Historical early-October averages hover near 21–22°C, with current guidance reflecting typical post-summer cooling and weak steering patterns. Trader emphasis on the 25°C+ bin alongside clustered probabilities for 20–24°C reflects model spread and the narrow diurnal range typical at altitude, with resolution hinging on official Servicio Meteorológico Nacional observations.