**Recent forecasts from multiple models, including GFS, ECMWF, and official Finnish Meteorological Institute guidance, converge on a daytime high of 19–20 °C for Helsinki on 29 August 2026.** This consensus underpins the market’s heaviest volume on those two outcomes (combined ~69 % implied probability), with 21 °C still carrying meaningful but lower weight. Key drivers include persistent southeasterly flow ahead of a weakening high-pressure ridge, which limits strong daytime heating while preventing significant cool advection. Light-to-moderate winds (generally 5–8 m/s) and increasing cloud cover on the 29th are expected to cap the maximum, keeping readings close to or slightly above seasonal norms for late August (historical average high ~18 °C). Ensemble spreads remain modest, with only limited upside risk if breaks of sun allow brief warming toward 21 °C or if thicker low cloud suppresses the peak nearer 18 °C. No major synoptic shifts or model updates have altered this picture in the past 48 hours, so trader sentiment remains anchored to the narrow 19–20 °C window ahead of final resolution.