Highest temperature in Seoul (Incheon) on August 3?

Platform comparison

Market context

The contract hinges on the **highest reading at Incheon International Airport Station** on 3 August 2026, so the key issue is not Seoul’s city-centre heat alone but whether the airport site reaches the band that settles the market. Current crowd pricing at **0% YES** leaves a large gap to published weather expectations, with forecasters pointing to a hot, mostly clear day and daytime highs around **32–34°C in Incheon** and **37°C in Seoul**, though the market resolves on the airport station rather than the capital’s broader forecast.[3][8]

That makes this a useful cross-platform comparison. KMA-linked reporting and local coverage broadly describe a severe heatwave across the capital area, but Incheon is forecast a few degrees cooler than central Seoul, which helps explain why bookmakers or traders could be materially less aggressive on the top temperature band than on a generic “Seoul” heat question.[1][3][8] Seasonal climatology also matters: August is typically the hottest month in South Korea, with Seoul averages around the mid-20s Celsius and frequent humidity, so a single hot day near the low- to mid-30s is not unusual, even if the station-specific peak ends up short of the upper brackets that some markets may be anchored to.[2][17][18]

For catalysts, traders should watch the Korea Meteorological Administration short-range updates, any change in the easterly flow noted in current reporting, and whether afternoon showers or sea-breeze effects reach the west coast and cap the airport maximum earlier than expected.[1][4][8] The main dependency is timing: the settlement window closes at noon UTC, so the relevant local daytime heating is still unfolding after market open, and revisions in the morning forecast can move the contract more than the broader monthly outlook from platforms such as AccuWeather or Met Office-style feeds.[2][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul (Incheon) on August 3? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Best Prediction Markets UK, which mirrors the Polymarket order book at 0% fees.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets UK. 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.

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.