Recent meteorological model runs from ECMWF and GFS ensembles point to a moderating Baltic Sea airflow and increasing cloud cover as the main drivers keeping Helsinki's August 5 high temperature centered near 20–22 °C, with traders assigning roughly equal weight to those three bins. Light southerly winds and limited daytime heating under scattered showers limit peak values, while any clearer breaks could push readings toward 23 °C; conversely, persistent low cloud or stronger onshore flow would favor 19 °C or lower. These short-range uncertainties, typical for mid-latitude summer conditions two days ahead, explain the closely matched market-implied probabilities and the rapid sensitivity to the next updated forecast cycles.