Forecast models from sources including the Finnish Meteorological Institute and global ensembles indicate a daily maximum in Helsinki on October 4 near 14–15 °C, driven by a mild southwesterly flow ahead of an approaching front. Overcast skies and periods of light rain or showers are expected to limit solar heating and keep the peak close to the seasonal average of 11.7 °C. Minor differences in model timing of precipitation and wind strength create the narrow spread between 14 °C and 15 °C outcomes. Historical records show October 4 highs above 15 °C are uncommon, supporting the tight market-implied probabilities around these two values.