Highest temperature in Seoul on July 10?

Platform comparison

Market context

The real-world event centres on whether Incheon International Airport will record a peak temperature of exactly 28°C on 10 July 2026, a threshold currently deemed virtually impossible by the crowd, which implies a 0% probability for the YES outcome. Historical data frames this extreme scepticism: July in Seoul typically sees highs between 24°C and 33°C, rarely exceeding 33°C, while the region recently endured its hottest early July in 117 years, with Seoul hitting 37.7°C in 2025, yet no record suggests a precise 28°C spike is a likely outlier [4][5]. The consensus treats 28°C as an underdog number, ignoring that recent super-hot tropical nights have broken century-old records, with Seoul staying above 25°C for 22 consecutive nights, suggesting the atmosphere is primed for volatility rather than a static, exact value [1][3].

Traders should monitor the Korea Meteorological Administration’s daily heatwave advisories and any incoming monsoon front schedules, as these dependencies often trigger sudden temperature drops or spikes that could invalidate the 28°C target. Recent news from Anadolu Ajansı confirms South Korea is experiencing record-breaking summer heat, with the nation recording its second-hottest July since 1973, meaning the baseline is already elevated and any contrarian angle must account for this sustained thermal pressure [5][7]. The value spot likely sits not on the 28°C exact, but on the broader range of 30–35°C, where the crowd’s 0% implied probability on the specific number creates a mispricing against the prevailing heatwave trend, making the contrarian bet on higher ranges the only logical play.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Who Will Win 2026. 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 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 Who Will Win 2026 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.