Recent ensemble forecasts from the Finnish Meteorological Institute and global models converge on a daytime maximum near 19°C at Helsinki-Vantaa on August 11, driven by moderate westerly flow, increasing cloud cover, and limited insolation that curbs boundary-layer warming. This aligns with early-August climatology, where average highs hover around 20°C, though light showers or variable mixing could nudge readings to 18–20°C. Traders price 19°C highest at 35% and 20°C at 25.5% because small shifts in timing of frontal passage or convective inhibition introduce the main uncertainty, with later model runs likely to refine resolution criteria before the market settles.