Recent forecasts from major numerical weather prediction models, including outputs referenced by the UK Met Office and BBC, indicate daily maximum temperatures in Istanbul on August 19 likely peaking between 27–30 °C under typical late-summer Mediterranean conditions. Sea breezes from the Bosphorus and northerly flows often moderate extremes, while clear skies and light winds support the higher end of that range. Model consensus clusters around 27–28 °C, aligning with the market’s leading implied probabilities and climatological August averages of 27–29 °C. No strong heatwave signals or major synoptic shifts appear in the latest runs, leaving modest uncertainty from timing of any cloud build-up or wind shifts that could nudge the peak by 1–2 °C. Updated model guidance over the next 48 hours will be the key near-term driver.