**Forecast models currently indicate a peak temperature in São Paulo on August 17 likely reaching 29–31 °C, driving the market’s concentration on those outcomes.** Official guidance and ensemble runs from sources such as INMET and global models show daytime maxima climbing from morning values near 17–20 °C to afternoon peaks of approximately 29.4–29.7 °C under partly cloudy skies and light winds. This places the most probable readings at or just above the long-term August average high of roughly 23–25 °C, reflecting a brief warming episode typical of late-winter transitions in the region rather than an extreme anomaly. Recent observational trends support this positioning: the highest temperature recorded so far this August reached 27.9 °C on the 8th, and current surface conditions on the 16th remain cooler at around 17 °C with high pressure and southeasterly flow. Model consensus has remained stable into the final 24–48 hours before the event, with limited spread that keeps probabilities for 32 °C or higher low (7 %) while still allowing modest upside risk from localized heating or slight forecast adjustments. Lower outcomes below 29 °C retain secondary support if cloud cover increases or the warm-air advection weakens sooner than expected. Traders are therefore weighting the 30 °C and 31 °C bins most heavily as the resolution window closes.