Recent forecasts from sources including AccuWeather and regional models place Amsterdam’s maximum temperature on August 21 near 20–21°C, aligning with the market’s heaviest weighting on 20°C. Late-summer conditions in the Netherlands’ temperate maritime climate typically feature moderating Atlantic air masses and daytime highs averaging 21–22°C, though a modest cooling trend often appears in the third week of August. Current ensemble guidance shows limited day-to-day variability and no strong high-pressure ridge or warm advection that would push readings into the mid-20s or drop them below 19°C. Traders are therefore pricing the narrow 19–21°C band as the most probable outcome, with updates from operational models expected to refine probabilities ahead of the 21st.