Forecast models for Helsinki on August 26 indicate overnight lows of roughly 12–14°C under overcast skies and light northerly winds near 6 km/h, limiting radiative cooling while Baltic Sea moderation prevents sharper drops. Official guidance from sources like timeanddate and the Finnish Meteorological Institute shows daytime highs near 19°C with minimal precipitation, consistent with late-summer climatology where average minima hover around 12–13°C. The tightly clustered market odds around 10–12°C reflect genuine uncertainty in exact minimum timing, cloud persistence, and station-specific readings at Helsinki-Vantaa, where small shifts in humidity or wind could tip the recorded low within this narrow band. No major synoptic changes have altered the outlook in recent days.