**Trader consensus on the Mexico City high for August 10 centers on 24–25 °C because current forecast guidance and seasonal climatology both point to that narrow range.** Mexico City sits at roughly 2,240 m elevation, so even in the heart of the rainy season daily maxima normally reach only 23–25 °C. August 2026 model runs and extended-range outlooks show a typical pattern of morning sun followed by afternoon convection, which limits daytime heating while keeping the thermal profile close to the long-term average high of ~24 °C. Recent ensemble guidance has not introduced strong warm or cool anomalies, keeping the distribution tightly peaked around the 24 °C and 25 °C bins that together command more than 70 % of market-implied probability. Slight downside risk to 23 °C exists if thicker cloud cover or earlier rain develops, while any break in convection could allow a brief push to 26 °C; both outcomes remain low-probability given the stable steering pattern and moisture profile. With resolution only hours away, traders are weighting the latest official forecasts and model consensus most heavily, producing the observed concentration of probability in the 23–25 °C window.