Recent forecasts from the Finnish Meteorological Institute and European models indicate a daytime high near 19–20°C for Helsinki on August 22, driven by a weakening high-pressure ridge and moderating Atlantic flow that limits further warming. Late-August climatology in southern Finland shows average daily maxima around 18–19°C, with modest day-to-day variability tied to cloud cover, sea-surface temperatures in the Baltic, and boundary-layer mixing. The tight clustering of market-implied odds on 18–20°C reflects model consensus on these factors, while small spreads between outcomes capture residual uncertainty in the precise timing of any weak frontal passage or diurnal heating under partly cloudy skies. Updated short-range guidance expected within 24 hours will likely refine the exact peak before resolution.