Recent official forecasts indicate a shift toward increased cloud cover, humidity, and thunderstorm activity over São Paulo by October 11, limiting surface heating after warmer conditions earlier in the week. Multiple models converge on daytime maxima near 24–27°C, with southeasterly winds and precipitation reducing insolation and enhancing evaporative cooling. Ensemble spreads reflect uncertainty in exact storm timing and intensity, which can alter peak readings by 1–2°C. This scientific variability underpins the tight market clustering around 26–28°C, where traders weigh National Meteorological Service guidance against local model runs ahead of the resolution window.