Highest temperature in Seoul on June 23?

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Market context

On 23 June 2026, the highest temperature recorded at Incheon International Airport will determine the outcome of a prediction market focused on Seoul’s peak heat, with current crowd-implied probability at 0% for any specific range. This reflects a market still forming, as traders await definitive data from Wunderground, the official resolution source. The settlement window closes at 12:00 UTC on 23 June 2026, meaning real-time observations from the airport station will be critical in the final hours.

Historical patterns from Incheon show that late June typically sees maximum temperatures between 28°C and 31°C, with 29°C being the most frequent peak in recent years[1][8]. Current aviation data for the day indicates a maximum air temperature of 29°C, aligning with the Polymarket frontrunner[3]. This suggests that while the 0% crowd-implied probability may seem extreme, it likely stems from early uncertainty rather than a genuine expectation of cooler conditions.

Traders should monitor live updates from Wunderground and the National Weather Service for Incheon, particularly any shifts in wind, precipitation, or cloud cover that could alter the day’s peak[6]. The Met Office forecast for the day lists a maximum of 30°C, slightly above the current consensus, which could signal upward pressure if confirmed[9]. Any sudden change in humidity or monsoon activity—expected to intensify in July—may also influence the final reading[7]. These dependencies will shape the market’s trajectory as the settlement window narrows.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Seoul on June 23? 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

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

Is this market available outside the US?

Champions League Prediction 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.

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 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.

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.

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.