**Trader sentiment for the highest temperature in Buenos Aires on October 3 centers on incoming rain and persistent cloud cover that will limit daytime heating in early spring.** Official guidance and ensemble models show a system bringing showers and overcast skies, which reduces incoming solar radiation and typically caps maximum temperatures several degrees below clear-sky potential. Northerly flow may advect milder air, while any earlier or heavier precipitation would favor the lower end of the range around 16°C; delayed or lighter rain, combined with partial clearing, supports 17–18°C. Historical climatology places early October averages near 17–18°C, but the current pattern’s instability introduces meaningful spread across model runs. Market-implied odds cluster tightly on these outcomes because resolution depends on the precise timing and intensity of the rain band and the resulting cloud fraction during peak heating hours.