**Trader consensus clusters tightly around 24–26°C for Karachi’s minimum temperature on September 12, 2026, reflecting converging but still-variable forecast guidance for nocturnal cooling under typical late-summer conditions.** Official and model outputs place the overnight low in this narrow band: Pakistani Meteorological Department and multiple numerical forecasts (e.g., GFS-derived) indicate 24–26°C, consistent with seasonal baselines for mid-September when daytime highs reach 33–35°C and humidity remains elevated (70–80%). High moisture content limits radiative cooling despite partly cloudy to clear skies, while light southwesterly winds provide modest mixing that prevents deeper drops. Urban heat-island effects in the coastal megacity further moderate minima relative to rural surroundings. The spread across 24°C (47%), 25°C (51%), and 26°C (53.5%) outcomes stems from small differences in model-resolved cloud cover, dew-point depression, and boundary-layer mixing overnight—variables that can shift the exact minimum by 1–2°C. No major synoptic shift has occurred in the past 24–48 hours; an approaching low-pressure system from the Bay of Bengal is expected to increase rain chances only from September 14 onward, leaving today’s conditions stable and dry. Traders are therefore weighting the most recent model runs and local observations that keep the lowest temperature within this tight, historically typical range.