Latest ensemble forecasts from the Finnish Meteorological Institute and European Centre for Medium-Range Weather Forecasts project a daytime maximum of 16–17°C in Helsinki on May 17, driven by moderate southerly airflow advecting milder Atlantic air masses under partly cloudy skies and light winds. This positions 16°C (39.0% implied probability) and 17°C (30.5%) as the leading outcomes, reflecting modest uncertainty in afternoon peak heating tied to boundary-layer mixing and high-cloud timing. The projection sits slightly above the May climatological average of 14–15°C at Helsinki-Vantaa Airport, with models showing tight clustering that keeps lower (15°C at 19.5%) or higher (18°C at 5.1%) thresholds less likely absent unexpected clearing or increased insolation. Hourly observations through late afternoon will resolve any subtle divergences in these variables.