Recent KMA and regional model guidance points to a highest temperature in Busan on June 28 most likely in the 27–29 °C range, aligning with trader emphasis on 28 °C as the modal outcome. Key variables include the strength and position of the subtropical high, which modulates onshore flow and marine cooling from the Korea Strait, combined with daytime insolation, boundary-layer mixing, and any residual cloud cover from upstream disturbances. Coastal sites often see 1–3 °C suppression relative to inland areas, while weak pressure gradients can allow greater diurnal warming. With only 48 hours until resolution, updates to 00Z and 12Z model runs plus KMA nowcasts will drive further shifts in the dispersed probability distribution.