Current forecasts from multiple meteorological models indicate a high of 26–28°C for Istanbul on September 11 under stable high pressure, clear skies, and moderate northeasterly winds, consistent with late-summer climatology near 25–27°C. Trader consensus heavily favors 25°C (52.5% implied probability) as the most likely daily maximum, reflecting tight model agreement around this range and limited upside risk from stronger warming. Minor spreads to 24°C or 26°C capture residual uncertainty in local observations and exact peak timing, while probabilities drop sharply beyond these values. New model runs and official updates from Turkish meteorological services over the next 48 hours will provide the key data points for refining these market-implied odds.