Recent ensemble forecasts and regional model runs indicate a stable warm air mass over the eastern Mediterranean, with mostly sunny skies and moderate northeasterly flow expected to keep Istanbul’s August 26 maximum near seasonal norms. This positioning supports the tight market spread between 27°C (46%) and 28°C (37%), as small differences in boundary-layer mixing, Bosphorus sea-breeze timing, or minor cloud cover could shift the daily high by 1–2°C. Historical late-August climatology shows typical highs of 28–29°C, while current guidance from multiple agencies projects limited deviation absent any approaching frontal systems or strengthened subsidence. Traders are therefore weighting the narrow range most heavily, with probabilities reflecting genuine forecast spread rather than consensus on a single value. Updated model runs and official Turkish State Meteorological Service briefings ahead of the date will be the key near-term catalysts.