Current meteorological forecasts and climatological data indicate Mexico City daytime highs will reach the mid-20s Celsius on May 26, supporting the market-implied probability above 99% for a maximum temperature of 21°C or higher. Late-spring conditions under high pressure typically produce clear skies and strong solar heating at the high-elevation site, with official seasonal baselines from regional monitoring showing May averages near 25°C and low day-to-day variability. Ensemble model runs reinforce this outcome with minimal spread around the expected peak. An unexpected cold-front intrusion or major measurement revision remains the primary low-probability pathway that could shift the result below the threshold.