Mexico City's high on August 12 is expected near 25–26°C, with the closely matched market odds reflecting modest uncertainty in afternoon conditions. At 2,240 meters elevation, strong solar heating is tempered by the peak of the rainy season, when diurnal convection typically builds widespread cloud cover and scattered showers by midday, limiting peak temperatures. Recent model runs and observational trends show variable timing of these showers, which can shave 1–2°C off the daily maximum depending on coverage and intensity; clearer intervals could allow a brief push to 26°C while earlier or heavier rain favors 25°C. Historical August averages near 24°C provide context, but day-to-day variability in humidity, wind, and urban heat retention keeps the two outcomes nearly even in trader assessments.