Highest temperature in Seoul on June 9?

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Market context

Seoul's weather on 9 June 2026 will be measured at Incheon International Airport Station, with the settlement hinging on the single highest temperature recorded across the entire calendar day in Celsius.

June in Seoul sits at the threshold between late spring and early summer, with historical daily highs typically ranging from 26–28°C, though readings above 30°C occur in roughly one year in five during this period. The 0% crowd probability suggests traders are pricing in either an unusually cool pattern or uncertainty about whether the market will resolve at all. Comparable June days at Incheon show that temperatures below 20°C are rare but possible during unsettled weather systems, whilst sustained heat above 32°C would require an early heatwave—a pattern that has occurred but remains statistically less frequent in early June than mid-to-late summer months.

The key variable is the East Asian monsoon system's positioning in early June 2026. If a high-pressure ridge dominates the Korean peninsula, temperatures could push into the 30–33°C band; conversely, an active low-pressure trough or frontal system would suppress highs into the low-to-mid 20s. Weather model consensus and any issued heat advisories from the Korea Meteorological Administration in the week preceding 9 June will be the primary signals. Traders should monitor whether any tropical systems develop in the Western Pacific, as these can alter jet-stream positioning and steering patterns weeks in advance.

Methodology

We track Highest temperature in Seoul on June 9? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Where can I trade this market with the lowest fees?

On Champions League Prediction, 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.

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 Champions League Prediction?

Zero. Champions League Prediction 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, Champions League Prediction triggers a quick verification flow that finishes in minutes.