Highest temperature in Seoul on June 20?

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Market context

Incheon International Airport’s highest temperature for the day is the figure that settles this market, so the key question is whether Seoul-area heat reaches the low- or mid-30s Celsius before the 12:00 UTC cut-off. June in Seoul normally sees daytime highs rising through the month, with typical daily maxima around 25–27°C and rarely above 31°C, which makes a sub-30s outcome the statistical default rather than an outlier.[1][8]

That helps explain why the crowd-implied 1% YES looks consistent with a market that is effectively pricing a cooler day or at least no exceptional heat spike. South Korea has produced extreme heat in past summers, including a national record of 41.0°C at Hongcheon, but those events are materially above ordinary June conditions and are not the baseline for this settlement.[2] Recent Seoul history also shows that June can still produce occasional warm surges, with one historical daily high reaching 90.1°F, or about 32.3°C, in mid-June 2026 data captured by Visual Crossing.[3]

For traders, the main catalysts are the overnight and morning temperature trend, cloud cover, and any short-notice weather service updates before the airport station’s daily high is locked in. June forecasts for Seoul have shown a wide daily range, with AccuWeather putting June highs between 74°F and 89°F, so the book can reprice quickly if the day opens warmer than expected or if winds and sunshine persist into late morning.[4] The practical funding angle matters too: deposits that clear immediately through rails such as Klarna or USDC can reach the market in time to capture those early-morning moves, while slower SEPA transfers are more likely to miss the thin window when depth is set.[4]

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

Is this market available outside the US?

Polymarket Klarna UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on Polymarket Klarna UK?

Zero. Polymarket Klarna UK 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, Polymarket Klarna UK triggers a quick verification flow that finishes in minutes.