**Forecast consensus from multiple sources positions the overnight low in Istanbul for September 2, 2026, near 20–22°C under mostly sunny skies and light-to-moderate northeasterly winds.** Models show high pressure and clear conditions overnight, supporting radiative cooling to these levels without significant advection of colder air or cloud cover that would alter the minimum. Daytime highs are projected around 29–30°C, consistent with early-September climatology but on the warmer side of the long-term average low near 17°C. Trader-implied probabilities reflect this narrow range, with 22°C at 61.5% leading, followed closely by 20°C and 23°C near 50%. Lower outcomes (17–19°C or 24°C+) carry far less weight, aligning with the absence of cold fronts or unusual cooling mechanisms in current guidance. Minor model spread in dew points and wind speeds creates the modest uncertainty around exact thresholds, but no major revisions or extreme scenarios appear imminent before resolution.