Recent forecasts from the Finnish Meteorological Institute and other models indicate a high around 18–20°C for Helsinki on August 22 amid overcast skies and light southerly flow, limiting daytime heating compared to clearer conditions. Cloud cover and modest advection of cooler maritime air are the dominant factors keeping maxima near seasonal norms rather than allowing brief spikes above 21°C. With leading market outcomes tightly clustered, traders are pricing genuine short-range uncertainty from model spread on exact timing of any breaks in cloud and subtle variations in wind direction that could shift the daily peak by 1–2°C. Updated runs ahead of the 22nd will clarify whether the implied probability tilts toward 19°C or remains split between 18–20°C.