**Trader sentiment for the lowest temperature in São Paulo on August 30, 2026, centers on a tight cluster around 17–20°C, with 17°C-or-below and 19°C each at 49% implied probability and 18°C/20°C near 47%.** This reflects current official forecasts from sources such as the Met Office and regional models projecting a nighttime low in the upper teens Celsius, consistent with mild late-winter conditions. Sao Paulo’s subtropical highland climate (Köppen Cwa) at ~760–800 m elevation typically features August lows near 12–15°C, driven by radiational cooling under clear skies and occasional polar air intrusions from the south. On this date, however, warmer advection, limited cloud cover, and the absence of a strong cold front have kept overnight temperatures higher. Hourly observations and model consensus show temperatures falling to ~17–19°C in the pre-dawn hours, with dew points and light winds supporting modest cooling rather than sharp drops. The near-even split between sub-18°C and 19–20°C outcomes hinges on small differences in boundary-layer mixing, urban heat-island effects, and exact timing of any residual moisture or wind shifts. Recent model runs show tight clustering without strong outliers, limiting shifts in market-implied odds. Upcoming official minimum readings from INMET stations will resolve the market once the full 24-hour period ends.