Recent forecasts from multiple models, including GFS and regional meteorological services, indicate a maximum temperature near 22–23°C for Istanbul on September 26 under partly cloudy skies with moderate northeasterly winds of 15–25 km/h. This aligns with seasonal September norms around 23°C while reflecting a transitional atmospheric pattern ahead of cooler, more unsettled conditions expected later in the week. Trader consensus heavily favors 22°C at 69% implied probability, consistent with model runs showing limited daytime heating due to cloud cover and onshore flow, though minor upward revisions remain possible if clearer conditions develop. Official observations from Turkish meteorological stations will determine the daily high for market resolution.