Highest temperature in Seoul on July 1?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at Incheon International Airport on 1 July 2026, measured in degrees Celsius. On Polymarket today, the contract prices "30°C" as the frontrunner at 58%, while the "YES" outcome for any temperature exceeding a specific threshold sits at 0% implied probability, suggesting traders doubt a record-breaking spike will occur. This pricing reflects the on-chain mechanics where USDC settles conditional tokens on the Polygon network, with liquidity concentrated around the 29°C to 30°C range rather than extreme outliers.

Historical data frames this low probability for extreme highs, as July in South Korea is the peak of the monsoon season (Jangma), bringing heavy, concentrated rainfall that often suppresses maximum temperatures despite high humidity. While daily average highs can approach 30°C and feel like over 34°C due to 80% humidity, the rain clouds typically prevent temperatures from soaring to the 36°C levels seen in early July heatwaves in the Greater Seoul region[2][5]. The wettest month in Korea usually sees short but intense downfalls that clear the air, making a 40°C day unlikely and keeping the market anchored near the 30°C median[2][8].

Traders should monitor the Korea Meteorological Administration's short-range forecasts for precipitation probability and wind direction, as a shift to dry, light winds could trigger a rapid heat spike[4][9]. Recent reports indicate heatwaves are already gripping the region with temperatures hitting 32°C in June, suggesting the baseline is warmer than usual, yet the monsoon dependency remains the critical variable[7]. Any official announcement regarding the end of the rainy season or a sudden shift in the jet stream would be the primary catalyst for a price re-evaluation, though current schedules point to continued cloud cover and rain through mid-July[2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul on July 1? 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 Polymarket Scam?, which mirrors the Polymarket order book at 0% fees.

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 Polymarket Scam?. 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'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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Scam? trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.