Persistent rain showers, northerly winds of 15–30 km/h, and extensive cloud cover have kept Istanbul temperatures suppressed on September 29, with official forecasts from multiple meteorological sources indicating a daytime high near 19°C. This falls below the late-September climatological average maximum of around 22–23°C, as cooler maritime air and evaporative cooling from precipitation limit warming. Model consensus and real-time observations show readings stabilizing in the upper teens Celsius through afternoon hours, supporting the market's strong preference for 19°C (53.5% implied probability) over 20°C (37%). Minor variations in rainfall timing or wind strength could still influence the final peak before resolution.