Recent forecasts from meteorological models indicate Seoul's overnight low on June 19 will likely settle near 19–20°C, with trader consensus closely split between these outcomes due to variable cloud cover and isolated thunderstorm potential that modulates radiative cooling overnight. Persistent humidity from the early monsoon transition and light winds limit temperature drops compared to clearer conditions, while daytime heating to around 31°C sets a baseline for the diurnal range. Minor model differences in timing of cloud increases or shower activity create the narrow spread, with historical June averages for minimum temperatures near 17–19°C providing context but recent patterns favoring slightly milder nights. Updated guidance from agencies like the Korea Meteorological Administration in the coming hours could refine these projections ahead of market resolution.