Highest temperature in Seoul on July 2?

Platform comparison

Market context

The underlying event is the highest temperature recorded at Incheon International Airport on 2 July 2026, a date falling squarely within South Korea’s hot, humid monsoon season. Historical data confirms July is the rainiest month, yet daily highs frequently reach 30–32°C, with midday feels exceeding 34°C due to humidity above 80%[1][8]. A comparable case is the Seoul 1 July 2026 market, where the 30°C bracket surged to 69.5% probability just hours before resolution, reflecting strong seasonal confidence in high temperatures[2]. The current 0% YES implied probability for this contract therefore appears starkly divergent from both analyst consensus and recent sportsbook lines on adjacent July dates, suggesting a potential mispricing rather than a genuine expectation of cool weather.

Traders should monitor real-time heatwave advisories from the Korea Meteorological Administration and Wunderground’s hourly updates for Incheon, as clear skies following monsoon showers can trigger rapid temperature spikes[5]. Recent interviews indicate this summer’s heat arrived 2–3 weeks earlier than last year, a trend that may persist into early July[10]. Additionally, the Sinchon Water Gun Festival in late July, while not directly affecting 2 July, signals broader seasonal warming patterns and increased public activity that often correlate with higher ambient temperatures[1]. No official cooling announcements are scheduled, and the absence of cloud cover forecasts increases the likelihood of record highs, making the 0% probability line increasingly questionable as settlement nears.

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). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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'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.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.