Recent forecasts from the Finnish Meteorological Institute indicate a mild spring day in Helsinki with limited daytime heating under variable cloud cover and light southwesterly flow, positioning 16°C as the market-implied frontrunner at 35.5% amid tight clustering around the seasonal mean. Model ensembles show afternoon peaks most likely settling between 15°C and 17°C, with the leading outcomes reflecting modest uncertainty in boundary-layer mixing and insolation timing rather than any sharp warm or cool anomaly. Historical May climatology for the Helsinki-Vantaa station supports this range, as does the absence of strong high-pressure ridging or cold advection that could shift probabilities further. Updated FMI guidance and evening observations will clarify the exact maximum before resolution.