Traders see 14°C and 15°C as nearly equally likely because ensemble forecasts place Buenos Aires’ June 26 maximum right at the long-term seasonal average, with only modest spread from expected southerly flow and limited moisture. Subtle differences in predicted low-level cloud cover, boundary-layer mixing depth, and weak frontal timing can shift the peak by 1°C, keeping those two outcomes dominant. Official resolution will rely on Servicio Meteorológico Nacional station data, where urban heat-island effects and precise measurement timing add final uncertainty. New model runs overnight and early-morning observations will be the next key inputs before the market settles.