Highest temperature in Seoul on June 23?

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Market context

The underlying event is the highest temperature recorded at Incheon International Airport on 23 June 2026, a date that falls in late June when Seoul typically experiences rising heat and humidity before the monsoon season intensifies. Current crowd-implied probability for any specific outcome sits at 0% YES, suggesting the market has not yet assigned meaningful odds to a particular temperature range, which diverges sharply from comparable contracts on other platforms where traders have already clustered around 27–29°C.

Historical patterns and cross-platform data frame this 0% probability as premature rather than indicative of an anomaly. On Polymarket, the highest temperature for Seoul on 24 June is heavily priced at 28°C (39%) and 29°C (28%), while AccuWeather forecasts daily highs for Seoul in June 2026 between 83°F and 89°F (28–32°C), with an average of 86°F (30°C). Late June in South Korea is notably hotter and more humid than early June, with temperatures often reaching 29°C, making the current lack of implied probability a clear divergence from analyst consensus and established seasonal trends.

Traders should monitor the Korea Meteorological Administration’s short-range forecasts and Wunderground’s real-time updates for Incheon, as the monsoon season typically begins in June and July, bringing sudden shifts in temperature and precipitation. A recent TourRadar report notes that summer weather in South Korea can become extremely hot, urging hydration and sun protection, while the KMA currently records a maximum daytime temperature of 31°C for 23 June 2026. These dependencies—particularly the timing of the rainy season and the intensity of the South Korean sun—will likely catalyse odds movement once traders react to the first official high-temperature readings for the day.

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 Best Prediction Markets 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.

Is this market available outside the US?

Best Prediction Markets 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.

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.