**Forecasts for Warsaw on September 4, 2026, point to a highest temperature most likely in the 20–22 °C range, aligning closely with the market’s leading outcomes (21 °C at 30 %, 22 °C at 28 %).** Multiple models and meteorological sources converge on daytime highs near 21 °C under mostly cloudy skies, with a 30–60 % chance of showers or light rain and moderate southwesterly or westerly winds. These conditions limit daytime heating by increasing cloud cover, raising humidity, and enhancing evaporative cooling from precipitation. Key scientific drivers include an unsettled synoptic pattern featuring low-pressure influence and frontal passages that advect milder, moist maritime air rather than warmer continental air masses. Surface pressure is expected to trend lower (around 1005–1013 hPa), supporting cloud formation and scattered showers that suppress the daily maximum. September climatology for Warsaw shows average highs of roughly 18–20 °C, so current guidance sits slightly above normal but remains well below any heat-advection scenarios. The narrow spread between 21 °C and 22 °C (and modest probability on 23 °C) reflects typical ensemble uncertainty in exact timing of cloud breaks or rain intensity. Minor differences in model runs—such as the degree of afternoon clearing or slight variations in wind speed—can shift the peak by 1 °C. Stronger or more persistent rain would favor the lower end of the range, while any unexpected breaks in cloud cover could push toward 23 °C. No major model shifts have occurred in the past 48 hours, keeping trader sentiment tightly clustered around these values with limited tail risk for extremes.