Highest temperature in Seoul on July 7?

Platform comparison

Market context

On 7 July 2026, the market will resolve based on the highest temperature recorded at Incheon International Airport, a critical benchmark for Seoul’s summer heat. While the current crowd-implied probability for the “YES” outcome sits at 0%, this figure demands scrutiny against historical precedents. July in Seoul typically sees daily highs climb from 81°F to 85°F, rarely dipping below 74°F or exceeding 91°F[1]. Recent years have defied norms: South Korea recorded its second-hottest July since 1973, with an average of 27.1°C, and Seoul itself hit 37.7°C in early July—the highest such reading in 117 years[4][7]. A new all-time national record of 41.0°C was set in Hongcheon, underscoring the region’s escalating heat volatility[2].

Traders must monitor real-time Wunderground data for Incheon, as the market resolves exclusively on this station’s peak reading[2]. Key catalysts include the Korea Meteorological Administration’s daily heat advisories and the prolonged streak of “tropical nights” where overnight temperatures exceed 25°C, a phenomenon that broke a century-old record in Seoul[6][8]. Recent reporting from Anadolu Ajansı highlights that such extreme heat is no longer confined to daytime, with night-time warmth persisting and amplifying daily peaks[7]. Divergence exists between sportsbook lines, which often underweight late-July spikes, and prediction markets, where the 0% probability may reflect an overly conservative view of Incheon’s specific microclimate compared to Seoul’s urban core. Analyst consensus increasingly flags late-July heatwaves as probable, suggesting the current odds may misprice the risk.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Seoul on July 7? 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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.

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 vs Polymarket 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.