Highest temperature in Seoul on June 21?

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Market context

Incheon Airport’s top reading on 21 June is being priced like a **low-to-mid 20s Celsius** day, with the crowd currently assigning **0% to YES** on the market’s threshold structure and treating higher bands as unlikely. That makes the favourite the milder outcomes and leaves the **underdog** angle on a hotter-than-normal spike, especially if afternoon heating outperforms the usual coastal moderation around Seoul’s airport corridor.[1][2]

For context, late-June Seoul typically runs near **26°C** for daily highs, with June highs often sitting in the high-20s Celsius range and occasionally pushing into the upper-20s or low-30s on warmer spells.[2][3] Recent Korean summers have also produced sharp heat outliers, including record-breaking June warmth across South Korea in 2025, which is the main reason contrarian traders should not dismiss the upper temperature bands outright.[7][9] The market’s consensus therefore looks anchored around normal June warmth, while the value sits with any forecast that calls for a stronger-than-average warm-up.

The main catalysts are straightforward: the day’s actual high at **Incheon Intl Airport Station** as logged by Wunderground, plus the usual intraday swing between morning cloud, sea breeze influence and afternoon sun. In a setup like this, the key handicapper’s note is whether the airport stays under the broader Seoul urban heat plume or catches a late-day spike; a hotter marginal outcome can matter more than the headline city average because settlement depends on the **single highest recorded temperature** at the airport station.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does it cost to trade on Who Will Win?

Zero. Who Will Win routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Who Will Win triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.