**Forecast consensus from the India Meteorological Department and other models points to a minimum temperature near 27°C in Lucknow on September 21, with mostly clear skies and light northerly winds supporting moderate nocturnal radiative cooling.** High dew points around 24–26°C and humidity above 70% limit how far temperatures can drop, while the post-monsoon transition keeps daytime heating elevated but allows clearer nights than peak monsoon conditions. Historical September minima average near 26°C, providing context for the narrow spread traders are pricing. Small shifts in cloud cover, wind, or moisture advection over the next 48 hours could nudge the low by 1–2°C in either direction, explaining the closely matched implied probabilities across the 23–31°C range. Updated IMD briefings and model runs remain the key near-term catalysts.