Highest temperature in Seoul on July 5?

Platform comparison

Market context

The underlying real-world event is the peak heat expected at Incheon International Airport on 5 July 2026, a date historically prone to extreme temperatures in South Korea’s capital region. Polymarket prices this contract today at 0% YES, implying the crowd believes the temperature will not reach the highest threshold defined in the market, despite Seoul’s July averages regularly climbing above 28.9°C and daily highs often nearing 30°C, with humidity pushing felt temperatures beyond 34°C during midday heatwaves.

Historical data frames this low probability cautiously: Seoul recorded 37.8°C on 8 July in an early-July record, the highest ever for that period, suggesting that even a single day in early July can shatter expectations. Yet, July is also the wettest month in Korea, with the monsoon season (Jangma) bringing concentrated, heavy rainfall that can temporarily suppress peak temperatures. This duality—intense heat versus monsoon suppression—creates the ambiguity traders must weigh when assessing whether the 0% price is justified or an underreaction to outlier heat potential.

Traders should monitor the Korea Meteorological Administration’s short-range forecasts for Incheon, particularly any shifts in cloud cover and precipitation probability, as these directly influence maximum temperature readings. Recent reports from The Straits Times highlight that Seoul has already experienced record-breaking early-July heat, reinforcing the need to watch for official announcements on summer heat advisories and monsoon progression schedules. On-chain, conditional tokens priced in USDC on the Polygon network will resolve based on Wunderground’s official daily maximum, so real-time weather data updates remain the critical dependency for accurate positioning.

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Methodology

We track Highest temperature in Seoul on July 5? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Legit?. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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 Polymarket Legit? trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.