Highest temperature in Seoul on July 17?

Platform comparison

Market context

Seoul faces its peak summer heat on 17 July 2026, with the Incheon International Airport station set to record the day’s highest temperature in degrees Celsius. The prediction market currently shows a 0% implied probability for a “YES” outcome on any specific threshold, yet Polymarket data reveals a stark divergence: the frontrunner is 31°C at 76% probability, while 32°C or higher holds 22% [1]. This gap between the zero-implied line and the active odds suggests a potential mispricing or structural quirk in the current contract, as traders clearly expect mid-30s Celsius readings rather than cooler conditions.

Historical precedent frames this expectation firmly. July 2025 marked Seoul’s hottest month since 1908, with a heatwave persisting until at least 16 July, indicating a strong seasonal trend toward extreme temperatures in mid-July [2]. Comparable cases from recent years show that Incheon Airport frequently records highs between 30°C and 34°C during this period, making the 31°C consensus on Polymarket align with long-term climatic patterns rather than outlier speculation.

Traders should monitor real-time updates from Wunderground, the official resolution source, as the settlement window closes at 12:00 UTC on 17 July. No new announcements are scheduled, but the dependency on live station data means any cloud cover or wind shifts could alter the final reading within hours. The absence of a “YES” probability on the current platform contrasts sharply with the active odds elsewhere, highlighting a need for cross-platform verification before committing capital.

Sources: 1 · 2

Methodology

We track Highest temperature in Seoul on July 17? 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

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 Best Prediction Markets UK 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.