Recent forecasts from models and INMET monitoring place São Paulo’s June 19 maximum near 23–25 °C under typical austral-winter conditions, with market-implied odds clustering tightly on 24 °C (33.5 %) and 25 °C (29.5 %). The city’s 760 m elevation and shorter winter daylight limit daytime heating, while recent cold-front passages earlier in June have maintained below-normal temperatures and variable cloud cover that can suppress or enhance the daily peak by 1–2 °C. Subtle differences among leading outcomes hinge on the exact timing of any residual frontal moisture, boundary-layer mixing, and urban heat-island effects captured by official INMET stations; stronger insolation or clearer skies would favor the upper end of the range, whereas lingering low-level stratus would cap readings closer to 23 °C.