Recent forecast guidance from the Finnish Meteorological Institute and European models indicates a stable high-pressure influence over southern Finland, supporting maximum temperatures near 15–17°C on June 13 with limited daytime heating due to persistent cloud cover and light northeasterly flow. This positions 17–18°C as the most probable range, aligning with the market’s leading 33% and 18% implied probabilities, while warmer outcomes above 19°C would require unexpected clearing or southerly advection not currently favored. Historical June climatology in Helsinki shows mean daily maxima of 16–19°C, but short-term model spread and potential for minor timing shifts in frontal passages introduce the observed dispersion across 16–20°C bins. Updated model runs and observational data over the next 48 hours will further refine these probabilities ahead of market resolution.