**Forecast models currently point to an overnight minimum around 14–16°C for Helsinki on August 31, 2026, with the market’s near-even distribution across 12–16°C reflecting genuine ensemble spread rather than any single dominant outcome.** Mild southwesterly flow off the Baltic Sea, combined with widespread cloud cover and scattered showers, is limiting radiative cooling and keeping temperatures elevated relative to the late-August climatological average low near 12°C. Official guidance from the Finnish Meteorological Institute and global models (including recent runs) shows daytime highs near 17–19°C transitioning to nighttime values that bottom out in the mid-teens, with small differences in timing of any partial clearing or wind shifts creating the observed 12–17°C probability band. Because resolution depends on the precise daily minimum recorded at the official station, traders are weighting the latest high-resolution model outputs and any 24-hour forecast updates that could shift the lowest reading by 1–2°C. Historical precedent shows occasional cooler nights when clearer skies develop, but current conditions favor the warmer side of the distribution.