Trader sentiment for Madrid's peak temperature on August 13 centers on 39–40 °C because ensemble forecasts from European and U.S. models show a strong subtropical ridge building over the Iberian Peninsula, delivering clear skies, light winds, and strong insolation that typically push daytime maxima 5–7 °C above the August climatological mean of 32–34 °C. Recent model runs indicate surface dew points near 10 °C and 850 hPa temperatures supporting heat indices in this range, with limited disagreement on timing of the ridge’s peak. Urban heat-island effects in central Madrid add another 1–2 °C locally. While short-range guidance is relatively consistent, small shifts in steering flow or cloud cover could still alter the exact maximum, keeping 38 °C and 41 °C as secondary possibilities in the market.