Current ensemble forecasts from major models place Helsinki's August 9 maximum near 20–22 °C, driven by a weak high-pressure ridge over Scandinavia and moderate southwesterly flow off the Baltic Sea, where sea-surface temperatures remain near seasonal norms. This setup supports modest diurnal heating without strong advection of warmer continental air. Model spread arises mainly from differences in predicted cloud cover and the timing of any weak frontal passages, which can shave 1–2 °C off peak readings or allow brief clearing to push values toward 23–24 °C. Historical August maxima average around 20 °C, so the tight clustering of market-implied odds at 21–23 °C reflects traders weighting the narrow but non-zero probability of modest deviations from the consensus guidance ahead of the next high-resolution model runs.