**Forecast consensus from official sources like the Korea Meteorological Administration (KMA) and multiple models points to a daytime high of 29–31°C in Seoul/Incheon on August 28, 2026, aligning closely with the market's leading implied probabilities (30°C at 43%, 29°C at 22.5%, 31°C at 18%).** Persistent cloud cover, scattered showers or thunderstorms, and elevated humidity—driven by a lingering frontal system and residual monsoon moisture—are expected to moderate temperatures below recent peaks. Southerly or southeasterly flows and light winds will limit strong daytime heating, while the timing of any rain (often midday or afternoon) further caps the maximum. Historical late-August baselines for the region average near 29°C, and current conditions reflect a slight cooling trend from earlier heat. Traders appear to weight the tight clustering of numerical weather prediction outputs and KMA guidance, which consistently resolve in the 29–31°C band. Minor uncertainty stems from exact rainfall timing and intensity, which could nudge the peak by 1°C in either direction, but no major model divergence or sudden synoptic shift has emerged to broaden the distribution.