Recent ensemble forecasts from meteorological agencies indicate a narrow range of maximum temperatures around 20–22°C for São Paulo on June 11, driven by a passing cold front that introduces cooler, moist air and scattered rainfall, limiting daytime warming. This winter pattern aligns with climatological averages near 21°C but features model spread from subtle differences in frontal timing and cloud cover, producing closely matched market-implied probabilities for 20°C and 21°C outcomes. Official guidance from sources such as the National Institute of Meteorology highlights typical June variability in the region, with any shift in steering winds or precipitation timing capable of nudging the daily high by 1–2°C before resolution.