Short-term numerical weather prediction models from the Korea Meteorological Administration currently cluster maximum temperatures for Incheon on August 12 near 32–34 °C amid an ongoing regional heatwave driven by a strong subtropical high-pressure ridge. Key differentiating variables include the precise timing and coverage of afternoon cloud build-up, which can suppress peak readings by 1–2 °C, and the strength of the sea-breeze circulation off the Yellow Sea that often moderates coastal Incheon relative to inland Seoul stations. Ensemble spread remains modest but non-negligible at this 48-hour lead, with newer model runs expected to refine boundary-layer moisture and wind forecasts before resolution. Trader consensus reflected in the closely matched 31–33 °C probabilities therefore tracks the narrow range of plausible outcomes under these synoptic conditions.