Recent numerical weather prediction models, including those from the Finnish Meteorological Institute, indicate a high of 15–16 °C for Helsinki on September 28 under partly cloudy skies and light southerly winds. This places the outcome near the long-term September average high of roughly 13 °C but slightly above it due to a stable high-pressure ridge and modest warm advection. Hourly guidance shows afternoon peaks clustered tightly around 15–16 °C, with minimal precipitation risk and limited model spread in maximum temperature. Trader consensus at 50 % for 16 °C and 41 % for 15 °C reflects this narrow forecast envelope, where small differences in cloud timing or boundary-layer mixing could determine the exact daily maximum.