Recent forecasts for Helsinki indicate daytime highs near 18–20°C with overnight minima likely settling between 11–14°C, yet market odds cluster tightly across 9–14°C outcomes due to model divergence on nocturnal radiative cooling. Primary drivers include variable cloud cover—clear skies enhance longwave radiation loss and surface inversions, potentially pushing minima toward 9–10°C or lower—while increased low-level moisture or light winds from Baltic Sea influences limit drops. A lingering low-pressure anomaly over northern Europe and possible frontal passage could introduce showers, moderating temperatures upward. Historical August climatology shows typical minima near 11–12°C, but short-term ensemble spread in ECMWF and local guidance keeps sub-10°C and mid-teen scenarios viable until updated model runs clarify boundary-layer conditions overnight.