Highest temperature in Seoul (Incheon) on August 9?

Platform comparison

Market context

Seoul’s temperature on 9 August will be driven by whether the current heatwave still has enough strength to push the Incheon airport reading into a higher band before the settlement window closes. Recent coverage shows the capital has already seen extreme heat this week, with Seoul forecast near 39°C on 7 August and national temperatures still expected to reach up to 36°C on 8–9 August as the double high-pressure system weakens rather than disappears.[1][5][15]

The main context for a 0% yes price is that the market only resolves on the **highest** Daily Observations reading at Incheon International Airport, not the headline high in the summary box, so traders need the airport station’s actual midday and afternoon trace, not the city forecast, to beat the threshold. Comparable August patterns in Seoul usually sit much lower, and even this week’s spikes have been concentrated around the worst part of the heat dome, with Seoul’s year-high readings around 36–40°C reported earlier in the week before the weekend easing.[7][12] That makes a very hot but still transient regime the key benchmark rather than a sustained multi-day extreme.[6][9]

What matters now is whether KMA short-range updates keep the post-peak forecast elevated for the airport area, and whether cloud cover, sea breeze, or rain bands suppress the maximum during local daytime hours. Reuters reported on 6 August that Seoul could still reach 39°C as the heatwave peaked, while Korean outlets on 7–8 August said the system should ease over the weekend but remain hot on 9 August, a combination that leaves the main catalyst as the exact timing of any cooling trend versus the afternoon maximum at Incheon.[5][15][13]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Football-specific comparison page for Highest temperature in Seoul (Incheon) on August 9?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi (US-focused) or Manifold (play-money).

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