Recent official forecasts from the Finnish Meteorological Institute and ensemble models point to an overnight minimum near 12–14 °C in Helsinki on August 23, 2026, under moderate northerly flow and increasing cloud cover that limits radiational cooling. Late-August seasonal decline in solar insolation at this latitude, combined with Baltic Sea moderation, typically produces daily lows in this range, with historical climatology showing August minima averaging 9–13 °C. Trader consensus reflected in the 57.5 % implied probability for 14 °C incorporates these model runs and the absence of stronger cold-air advection, though any late clearing or wind shift could allow slightly lower readings before the daily minimum is recorded at Helsinki-Vantaa Airport. Updated guidance through the evening will refine resolution odds for this weather market.