Recent forecasts from AEMET and global models indicate scattered showers and thunderstorms over Madrid on October 3 due to a passing frontal system, which limits solar heating and caps daytime maxima near the 22.5°C climatological average. This instability, with easterly flow and high cloud cover, underpins trader consensus favoring 22°C as the most likely peak, followed closely by 21°C and 23°C. Ensemble spreads reflect modest uncertainty in exact timing and intensity of convection, while historical October data show similar synoptic patterns rarely exceeding 24°C. Updated model runs and AEMET briefings before market resolution will refine these probabilities.