Current forecasts from multiple models indicate a daily minimum temperature in Istanbul on October 15 most likely between 12–14°C, driven by persistent northerly winds and widespread showers that limit radiative cooling overnight. Cloud cover and moderate humidity further moderate temperature drops, while the air mass remains mild for mid-October. Trader sentiment shows near-even odds between sub-10°C and 19°C+ outcomes partly because short-range model runs exhibit minor spread in exact overnight lows tied to rain timing and wind gusts, with resolution depending on official station readings. Upcoming evening updates from agencies like the Turkish State Meteorological Service will clarify any shifts before the market settles.