Recent numerical weather prediction runs from the Finnish Meteorological Institute and European models indicate a likely daily maximum near 22°C for Helsinki on July 29, driven by moderate southwesterly flow, partial cloud cover, and limited daytime heating under a stable summer air mass. Ensemble spreads and minor model differences in boundary-layer mixing and cloud timing create genuine uncertainty between 21–24°C outcomes, aligning with the closely matched market-implied odds favoring 23–24°C. Historical July maxima average near 21°C, providing context for why traders assign only modest probability to 25°C or higher. Updated high-resolution forecasts and afternoon observations will refine these probabilities ahead of market resolution.