Persistent overcast skies, light rain, and southerly flow on October 9, 2026, produced a daily maximum of 13 °C at Helsinki-area stations, matching the precise threshold traders have priced at 100 % implied probability. Real-time surface observations from the Finnish Meteorological Institute network, corroborated by multiple numerical weather prediction runs, show temperatures peaking near midday before cooling under continued cloud cover and increasing westerly winds. Historical climatology places the October 9 average high near 10.6 °C, so this reading reflects a modest positive anomaly driven by transient warm advection rather than exceptional warmth. The only realistic path to a different resolution would be a post-event quality-control revision of the official maximum or an undetected localized spike above station readings, both of which remain low-probability outcomes given the dense observational network and model agreement.