Recent forecasts and climatological data position 28°C as the leading outcome for Istanbul’s August 24 high, consistent with late-summer norms of 27–30°C driven by typical subtropical high pressure and Mediterranean sea surface temperatures around 24–25°C. Ensemble models show modest spread around this baseline, with limited potential for stronger advection of warmer continental air or enhanced urban heat island effects that could push readings to 29–30°C. The market’s heavy weighting on 28°C reflects trader consensus on stable conditions and historical frequency of such maxima, while lower probabilities for 27°C or 31°C+ capture residual uncertainty in short-range model runs and local wind patterns near the Bosphorus. Updated guidance expected within 24 hours could refine these implied probabilities.