**Persistent cloud cover and widespread thunderstorms expected across São Paulo on October 11 will limit daytime solar heating and cap the maximum temperature in the mid-20s Celsius.** Multiple forecast models show a moist, overcast environment with southerly flow and high humidity suppressing warming, following a period of scattered storms and cooling from earlier in the week. Official observations from Brazilian meteorological services will determine the exact high, with key variables including the precise timing and coverage of convective activity plus any breaks in cloud that could allow brief warming spikes. Recent model runs have converged on 25–27°C outcomes, aligning with the tight market distribution around those levels and reflecting uncertainty in storm evolution rather than a broad range of possibilities.