**Recent weakening of a high-pressure system centered over Finland and Russia is allowing a frontal boundary to approach from the west, bringing increased cloud cover, showers, and moderating air masses to Warsaw for August 29.** Official IMGW-PIB guidance and multiple numerical models (including GFS) indicate daytime maxima in the 21–23°C range under mostly cloudy skies with light rain or thunderstorms possible, particularly in the morning and afternoon. This follows several days of clearer, warmer conditions with highs near 26°C. Westerly to southwesterly flow, rising humidity, and reduced solar insolation from the cloud deck are the main scientific drivers capping temperatures below recent peaks and aligning with historical late-August climatology for the region (typical maxima around 21–23°C). Ensemble forecasts show limited spread, supporting the market’s tight clustering around 21–23°C as the dominant outcomes, with lower probabilities for outliers reflecting uncertainty in exact timing and intensity of precipitation. Updated model runs and IMGW briefings through the evening of August 28 will provide the final data inputs ahead of resolution.