Traders see 16–19°C as the most probable range for Helsinki’s July 9 maximum because recent ECMWF and GFS model runs cluster daytime highs near 18–19°C, consistent with Met Office guidance of 19°C and Finnish Meteorological Institute observations showing mid-July temperatures in the mid-teens to low-20s. Moderate north-easterly flow off the cooler Baltic Sea, combined with variable cloud cover and scattered showers, limits strong daytime heating and keeps values below the seasonal average of ~21°C. Forecast spread of roughly ±1–2°C across ensemble members explains the tight clustering of implied probabilities around these four outcomes, while lower odds on 20°C+ reflect limited potential for clearing and stronger insolation. Updated model cycles through July 8 will remain the key catalyst before resolution on official observations.