Forecast models from the Pakistan Meteorological Department and international agencies indicate overnight lows in Karachi on October 13 will hover near 26°C under clear to partly cloudy skies with light westerly winds and high humidity near 80-90%. This supports the tight market clustering around 26°C (45%) and 27°C (42.5%), as radiative cooling remains limited by moist air masses typical of early post-monsoon October. Historical climatology shows average October minimums of 24-26°C, with recent days recording 25-26°C lows amid stable pressure patterns. Traders weigh minor model spreads on exact timing of the daily minimum against potential slight warming from urban heat effects or wind shifts. Final resolution depends on official hourly observations through the night.