Recent official forecasts from the Finnish Meteorological Institute and ECMWF ensemble models, supported by midday observations at Helsinki-Vantaa Airport, have locked in a maximum temperature of 19°C under a high-pressure ridge with mild southerly advection of Atlantic air and moderate solar heating amid partly cloudy skies. This synoptic setup aligns closely with the historical May climatology mean daily high of 15–16°C but benefits from enhanced radiative warming and light winds that prevent rapid cooling, explaining the market’s near-certain pricing for the 19°C outcome. A realistic shift away from this consensus would require unexpected increases in cloud cover reducing insolation or an abrupt change in wind direction that enhances cool northerly flow before the afternoon peak.