Forecast models from sources like Yr.no and WeatherBug point to overnight lows of 12–15°C in Mexico City on August 21 amid the peak of the rainy season, with widespread cloud cover, scattered showers, and light northerly winds limiting radiative cooling at the city's 2,240 m elevation. Persistent humidity above 80% and thunderstorm activity help retain heat overnight while preventing sharp drops, though clearer breaks could allow temperatures to dip toward 12–13°C. Trader consensus clusters tightly around 13–15°C because ensemble forecasts show only minor disagreements on exact cloud timing and wind patterns, creating genuine uncertainty around the precise minimum rather than a single dominant outcome.