Recent forecasts from European and global models indicate a transitional pattern over Warsaw on September 20, with southwesterly flow advecting milder maritime air ahead of an approaching frontal system. Cloud cover increasing through the night and early morning, combined with light to moderate showers, limits radiative cooling and supports minimum temperatures clustered near 13–15 °C. Trader sentiment remains nearly evenly split because small differences in the timing and intensity of precipitation, or in boundary-layer wind speeds, can shift the overnight low by 1–2 °C—enough to cross key resolution thresholds. Historical September climatology for the city shows typical minima around 10–12 °C, so current guidance reflects a modestly warmer regime driven by persistent westerly flow. Updated model runs and surface observations expected overnight will provide the clearest signal before the market resolves.