Recent forecast consensus from multiple models positions Istanbul's September 27 high near 21°C as the most likely outcome, driven by a strengthening northerly flow and associated frontal system that will increase cloud cover and bring scattered showers, limiting daytime warming. Saturday's clearer, warmer conditions (around 23–26°C) give way to this moderation, with highs suppressed relative to the seasonal average near 23°C. Leading market-implied odds for 20–21°C reflect this alignment, while lower probabilities for 22°C or above account for residual uncertainty in exact timing and intensity of precipitation. Updated model runs and official briefings in the next 48 hours will provide the key data points for any shifts.