Recent forecast runs from the Finnish Meteorological Institute, ECMWF, and GFS models indicate a highest temperature of 15–16 °C for Helsinki on September 29, driven by mild southerly flow ahead of a weakening frontal system and limited daytime heating under increasing cloud cover. Ensemble spreads remain narrow, with most solutions clustering near 15 °C as the daytime maximum, though a brief clearing window could allow brief peaks near 17 °C. Trader consensus, reflected in the tight 42.5 %–34.5 % split between 16 °C and 17 °C, tracks this model agreement while pricing residual uncertainty in exact timing of showers and boundary-layer mixing. Updated high-resolution guidance and afternoon observations on the 28th will further refine the distribution before market resolution.