**Recent ensemble forecasts from ECMWF and national models indicate a cooler-than-average day for Warsaw on August 18, driven by increased cloud cover, scattered showers, and westerly flow advecting milder maritime air.** Official guidance clusters daily maxima around 20–22°C, with overcast conditions and light precipitation expected to limit solar heating below the seasonal mid-August average of 23–25°C. Key variables differentiating the closely matched 18–21°C outcomes include the precise timing and coverage of showers, which can suppress highs by 2–4°C, alongside model differences in boundary-layer moisture and wind speed. Official agencies such as IMGW and the Met Office highlight moderate uncertainty in precipitation amounts through the 48-hour window, supporting the market’s tight clustering around 19–20°C as the most probable range based on current observational trends and short-range guidance.