Recent short-range forecast models indicate Istanbul's minimum temperature on August 23 will likely fall between 18–24°C, with trader odds clustered tightly around 20–24°C reflecting model spread on nocturnal cooling. Primary drivers include variable low-level humidity and wind speeds over the Bosphorus and Marmara Sea, which moderate radiative heat loss under partly cloudy conditions, alongside urban heat island effects that can elevate overnight lows by 1–3°C compared to rural baselines. Clearer skies in some ensemble members would enhance longwave radiation escape and support cooler readings near 17–18°C, while increased cloud cover or southerly flow favors warmer minima above 23°C. Historical August climatology places typical daily minima at 18–22°C, underscoring how small shifts in steering patterns or moisture advection can differentiate outcomes ahead of the next model runs.