Current short-range forecasts from the Indonesian Meteorological, Climatological, and Geophysical Agency (BMKG) and global models indicate Jakarta’s peak temperature on May 18 will most likely fall between 32 °C and 34 °C, consistent with the post-monsoon climatology that produces typical daily maxima of 31–34 °C under increasing solar insolation and reduced convective cloud cover. The market’s near-even split between the 33 °C and 34 °C outcomes reflects modest forecast spread arising from small differences in predicted boundary-layer mixing, urban heat-island amplification, and relative humidity levels that modulate the diurnal temperature range. Historical May observations show that extremes outside this narrow band occur only when unusual moisture intrusions or clear-sky anomalies develop, conditions not currently signaled by ensemble guidance. Updated model runs and the official BMKG daily bulletin expected in the next 24–48 hours will provide the decisive observational inputs for final resolution.