Recent forecasts from agencies like the Met Office and local models indicate Istanbul's September 22 minimum will likely fall in the mid-teens Celsius amid light rain and northerly winds advecting cooler maritime air. Trader sentiment remains split near 50% between 10°C or below and 20°C or higher because model runs diverge on the precise timing and strength of the frontal passage: stronger northerly flow and clearer post-frontal skies could enhance nocturnal radiative cooling below 15°C, while persistent cloud cover and precipitation may limit the drop by retaining heat and moisture. Historical September minima average near 16–17°C, but this system's wind shifts and dew-point depression introduce notable uncertainty ahead of final overnight observations.