**Forecast models indicate a minimum temperature in Helsinki on September 6 most likely between 7–9°C, driven by northwesterly winds advecting cooler maritime air and clear overnight conditions promoting radiative cooling.** Official guidance from the Finnish Meteorological Institute and ensembles such as those underlying Yr.no and Foreca show daytime highs of 15–17°C falling to lows near 8°C under partly cloudy skies with moderate northwest flow. Historical climatology places the September 6 average low at 10.8°C, so current conditions represent a modest negative anomaly. Model spread arises mainly from differences in predicted wind speeds and boundary-layer cloud cover, which affect the magnitude of nocturnal cooling; stronger winds or increased low-level moisture would limit the drop, while lighter winds and clearer skies could push readings toward 5–6°C. Traders price the tight cluster around 8°C highest because it aligns with the consensus of latest model runs, while the notable probability on 14°C+ reflects residual uncertainty in how quickly the cooler air mass establishes itself overnight. New model updates and official FMI briefings on September 5–6 will be the key catalysts for any shifts.