Official observations from the Finnish Meteorological Institute confirm a daily maximum of 16°C in Helsinki on September 30, 2026, reached during the afternoon under clear skies and light easterly winds. This aligns with model consensus from GFS runs showing a stable high-pressure ridge suppressing cloud cover and allowing modest solar heating, consistent with late-September climatology where highs typically range 12–15°C. Trader consensus at 100% for 16°C reflects the locked-in observational record, with minimal uncertainty remaining as the observation window closes. Only a significant revision to verified station data or an undetected microclimate anomaly could alter the outcome at this stage.