Forecast uncertainty for Kuala Lumpur's minimum temperature on September 22 stems from active convective patterns and high atmospheric moisture typical of the equatorial region in late September. Official outlooks from METMalaysia and other agencies indicate overnight lows near 25°C, consistent with historical September averages of 23–24°C and recent observations around 24–26°C, though thunderstorm clusters can suppress nocturnal cooling through increased cloud cover and humidity. Model spreads in steering flows and rainfall timing create divergence between scenarios favoring greater radiative cooling (potentially dipping toward or below 20°C) versus persistent warmth and rain keeping readings at or above 30°C. Traders appear to weigh these variables evenly, with specific-temperature contracts clustering around 25–26°C reflecting the most probable central tendency under current conditions. New model runs and regional briefings ahead of the date will likely refine the range.