Recent ensemble forecasts from the Met Office, GFS, and European models converge on a Warsaw maximum near 20°C for August 18, driven by westerly flow advecting cooler maritime air masses that increase cloud cover and favor light showers or early rain. These conditions limit surface insolation and suppress boundary-layer mixing, producing a cool anomaly relative to the seasonal climatological average of 23–26°C. Traders assign the highest implied probability (43%) to 20°C and 27.5% to 19°C because model consensus points to modest warming potential only if frontal timing shifts later in the day. Short-range model updates and real-time surface observations on the 18th remain the key variables that could refine the exact threshold before resolution.