Latest ensemble forecasts from European and global models indicate a daytime high in Amsterdam near 21°C on August 18 under predominantly overcast skies with light rain or drizzle expected, keeping surface heating limited by reduced insolation and modest onshore flow. Trader consensus clusters on 21°C and 22°C because small differences in cloud break timing, boundary-layer mixing, or slight model spread in maximum temperatures can shift the observed peak by 1°C, while historical August variability around 20–22°C adds further uncertainty. Official KNMI station readings at the close of the day will resolve the market, with any late-day clearing potentially pushing readings toward the upper end of current guidance.