Northeast winds and building high pressure are anchoring Istanbul's October 3 forecast near the long-term average high of 19°C, driving the 71% market-implied probability for that exact maximum. Multiple official and ensemble runs show daytime peaks of 19–21°C under partly cloudy skies with minimal precipitation risk and sustained northeasterly flow at 20–30 km/h, limiting daytime warming. Recent clearing after October 2 showers has reinforced this stable pattern, with no major model shifts in the past 24 hours. Traders assign only 27% odds to 20°C and negligible weight to outliers, reflecting tight consensus around typical early-autumn conditions rather than anomalous warmth or cooling. Updated NHC-style or national meteorological briefings tomorrow morning will provide the final resolution data.