Recent forecasts for Helsinki's minimum temperature on September 1 show model spread centered near 12–14°C, with official guidance and ensemble runs placing the overnight low most likely between 10–13°C under partly cloudy skies and light southwesterly flow. This narrow clustering explains the tightly matched market probabilities around those outcomes. Key differentiating factors include uncertainty in nocturnal cloud cover, which modulates radiative cooling rates, and the precise strength of boundary-layer mixing from lingering post-frontal moisture after August 31 thunderstorms. Clearer conditions could push the low toward 10–11°C, while increased cloudiness or warmer advection would favor 13°C or higher. Historical climatology places the average low near 11–12°C, providing a baseline that traders weigh against the latest high-resolution model consensus ahead of final verification.