Trader consensus on 24–25°C for Mexico City’s July 7 maximum reflects the city’s 2,240 m elevation and peak North American monsoon conditions, which favor afternoon convective showers and thunderstorms that cap daytime heating through increased cloud cover and evaporative cooling. Official guidance and ensemble models cluster around 22–24°C, consistent with climatological July averages near 23–24°C and recent runs showing light northeasterly flow with scattered precipitation. Differentiation between the closely matched 24°C and 25°C outcomes hinges on precise timing of convective initiation and any morning sunshine windows before storms develop; minor forecast shifts in the next 24 hours from Mexico’s SMN or updated global models could tip probabilities. Resolution will depend on the official highest temperature recorded at the primary observing site.