**Recent forecasts for Mexico City on September 1, 2026, point to a maximum temperature most likely in the 23–25°C range, aligning closely with market-implied probabilities that place 24°C at 41.5% and 23°C at 24.5%.** Multiple models, including those from WeatherBug, Worldmeteo, and official Mexican sources, project highs near 23–24°C (around 73–75°F) under mostly cloudy skies with a high probability of thunderstorms and heavy rain (70–95% chance in many runs). This is typical for early September in the rainy season, when afternoon convection and cloud cover limit solar heating. Mexico City’s high elevation (~2,240 m) keeps baseline temperatures moderate even in late summer, with historical September average highs around 24°C. Persistent moisture from Pacific and Gulf inflows, combined with low-pressure channels, drives widespread cloudiness and precipitation that caps daytime peaks—often preventing readings above 25°C. Current model consensus shows no strong ridge or clear skies that would allow 26°C or higher (currently only 3.5% implied), while cooler outcomes below 22°C appear unlikely absent an unexpected cold surge. Traders are pricing in this rainy, convective pattern as the dominant driver, with fresh 48–72 hour guidance reinforcing suppressed maxima near the seasonal norm rather than extremes. Updated model runs closer to the date will be key, especially any shifts in storm timing or coverage that could alter afternoon temperatures.