Highest temperature in Seoul on July 27?

Platform comparison

Market context

Polymarket’s contract on the highest temperature in Seoul on 27 July is currently pricing a **0% yes probability**, even though the live market still shows individual Celsius bands trading, with **31°C** the front-runner at 37% and **30°C** next at 32%[1]. For a Polymarket user, the relevant question is not Seoul weather in the abstract but whether the highest reading at Incheon Intl Airport Station lands inside the range that resolves the contract, with settlement determined from Wunderground and paid in the platform’s usual USDC-based conditional token structure on Polygon.

That pricing sits well below the broad seasonal backdrop. July in South Korea is normally hot and humid, with daily highs around 30°C and frequent heavy rain; late July can still deliver strong heat, and recent reporting has flagged temperatures across the country pushing into the low-to-mid 30s with above-average conditions persisting into early August[2][3][4]. On that reading, a zero price looks more like a market that has not yet fully repriced near-term summer heat than a statement that a warm outcome is impossible.

The main catalysts are the short-range forecast updates that flow into the final hours before the Wunderground daily maximum is locked in, especially any shift in cloud cover, rainfall, or a marine breeze around Incheon Airport. Traders also need to watch Korea Meteorological Administration guidance and the timing of midday heating, because a single hotter-than-expected afternoon can move the day’s maximum into a higher bin even if the morning looks benign[4]. Since the market resolves on the station record rather than citywide sentiment, airport-specific conditions matter more than headlines about Seoul generally.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Seoul on July 27? 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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