**Trader sentiment for Istanbul's lowest temperature on August 24, 2026, clusters tightly around 21–23°C because official forecasts and recent observations point to a stable late-summer pattern with overnight minima in that narrow band.** Coastal moderation from the Bosphorus and Sea of Marmara, combined with light winds and limited cloud cover under high pressure, prevents sharp cooling while also capping how warm the night stays. Current model consensus from sources such as the Met Office indicates a nighttime low near 22°C, consistent with typical early-August climatology (average lows of 18–20°C rising toward 21–23°C in warm spells). The close spread among 21°C, 22°C, and 23°C reflects small uncertainties in timing of any wind shift or thin high-cloud increase that could nudge the minimum by 1–2°C. Probabilities for 18°C or below remain modest because no significant cold advection or clear-sky radiative cooling event is expected, while the 28°C+ outcome captures the tail risk of unusually warm, humid conditions persisting through the night. Updated short-range model runs and local station observations over the next 24 hours will be the key catalysts that could shift these tightly bunched probabilities.