Recent passage of a cold front has suppressed temperatures across São Paulo, with official forecasts showing highs near 22–25°C on October 3 amid persistent cloud cover, light rain, and northeasterly flow that limits daytime solar heating. Subtropical spring conditions feature high day-to-day variability driven by frontal timing and moisture, keeping peak readings close to the early-October climatological average of roughly 22–24°C rather than the seasonal climb toward 26°C. Model consensus from sources such as INMET and international guidance supports this cooler regime, though small shifts in cloud thickness or frontal speed could alter the exact maximum. Traders price the tight cluster around 20–23°C highest because near-term observational updates and refined model runs will determine resolution within the narrow uncertainty range.