Highest temperature in Seoul on June 20?

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Market context

Polymarket is pricing this Seoul temperature range contract at **1% YES**, paid in **USDC** and settled through **Polygon** conditional tokens. For a user, that means the market is currently assigning a very small chance that the highest temperature recorded at Incheon Intl Airport Station reaches the YES band specified by the contract before the settlement window closes.

That low price sits against a June climatology that is normally warm but not extreme: WeatherSpark puts Seoul’s June highs around the high 20s Celsius to low 30s, with daily highs typically rising through the month and rarely pushing beyond the mid-30s Fahrenheit equivalent cited in its dataset[1]. Recent history matters here because the Korean Peninsula has already seen sharp June heat: the Korea Herald reported Seoul at 35.6°C on 19 June, the city’s highest June temperature since 1958[4]. That sort of outlier is the main reason a market like this can reprice quickly when a heat ridge builds over the peninsula.

A trader should watch the Korea Meteorological Administration’s short-term guidance, airport-area observations, and whether a heat advisory or hotter-than-expected upper-air pattern develops before midday local time, because the contract resolves on the single-day maximum at Incheon Intl Airport Station via Weather Underground[4]. The key mechanical point is that settlement depends on that specific station reading, not a broader Seoul average, so coastal moderation, sea-breeze timing, and any local cloud cover or rainfall can matter more than citywide headlines.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Kalshi UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 Kalshi UK?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi UK 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.