Latest Korea Meteorological Administration model runs project a daytime maximum of 31–32°C in Busan today under a strengthening high-pressure ridge and southerly flow that favors adiabatic warming over the coastal plain. These conditions differentiate the closely matched 31°C and 32°C contracts by producing modest additional heat advection while the nearby sea surface temperatures and expected afternoon sea breeze introduce enough moderation to keep odds on 30°C at 18 percent. Historical May climatology for Busan shows average highs near 22–24°C, so the current setup represents a clear positive anomaly driven by the synoptic pattern rather than long-term trends. Updated short-range guidance and official observations through late afternoon will determine final resolution within the narrow temperature bands traders are now pricing.