Recent forecasts from the Finnish Meteorological Institute and other models indicate a highest temperature in Helsinki on August 21 most likely between 18–20°C, aligning with trader consensus around these outcomes. Primary drivers include a weakening high-pressure system over Scandinavia yielding partly cloudy skies and light westerly winds, limiting diurnal warming while moderating overnight lows near 12–14°C. Ensemble spreads from ECMWF and GFS reflect modest uncertainty from variable cloud cover and possible isolated showers, which could cap peaks below 19°C or allow brief radiative heating toward 20–21°C. This range matches historical late-August norms for the region, where frontal passages often produce 1–2°C day-to-day variability. Updated model runs and local observations over the next 48 hours will refine resolution thresholds.