Market-implied odds heavily favor a daily high of 19–20°C in Istanbul on October 4, aligning with ensemble forecast consensus from regional models projecting stable high-pressure dominance and light northerly flow that curbs daytime heating. These values sit close to early-October climatological norms of roughly 20–22°C, with minimal expected contribution from Mediterranean moisture or passing fronts. Short-range model runs show limited spread, though minor adjustments in cloud cover or wind direction could nudge the outcome. Traders appear to weigh the tight clustering of guidance against inherent forecast uncertainty this close to the verification period, when updated observations will determine the official maximum.