Short-range ensemble forecasts from the Korea Meteorological Administration and global models like ECMWF and GFS show the highest temperature in Seoul on July 12 most likely near 32°C, reflecting midsummer conditions with high humidity, typical North Pacific high influence, and scattered precipitation that can moderate daytime maxima. Model spread arises from uncertainty in cloud cover, rain timing, and any weak frontal features, pushing some solutions toward 30–31°C under heavier showers while clearer or ridge-favored runs reach 34°C or higher. July climatology places average highs near 29–30°C, but recent early-month observations and 2026 seasonal patterns support the market’s tight clustering around the 32°C and 34°C+ bins, with resolution hinging on final observational data from official stations.