Highest temperature in Seoul on June 27?

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Market context

The underlying event is the peak daytime temperature at Incheon International Airport on 27 June 2026, which will determine the settlement of this prediction market. Historical data for Seoul in June shows daily highs typically rising from 77°F to 81°F, rarely dipping below 68°F or exceeding 87°F, with solar energy gradually decreasing through the month[2]. Recent records indicate South Korea experienced its hottest summer in 2025, with an average June-to-August temperature of 25.7°C, the highest since 1973, while Mokko hit 28.1°C in early June[7][8]. The current crowd-implied probability for the market is 0% YES, yet consensus heavily favours 28°C at 69% and 29°C at 30%, suggesting a significant mispricing if the market truly believes no outcome is possible[1].

Traders should monitor the Korea Meteorological Administration’s daily forecasts for the Seoul region and any sudden shifts in cloud cover or wind patterns that could suppress peak temperatures. A recent report from Weather Underground confirms South Korea set an all-time heat record of 41.0°C in Hongcheon, indicating the potential for extreme outliers if atmospheric conditions align favourably[3]. The value spot likely sits contrarian to the 0% implied probability, as the consensus overweights 28°C while historical June peaks in Seoul frequently approach or exceed 29°C[2]. Watch for official announcements regarding heat advisories in the Incheon area, as these often precede record-breaking days and could shift the market toward higher temperature ranges.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Seoul on June 27? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Is this market available outside the US?

Who Will Win is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What does it cost to trade on Who Will Win?

Zero. Who Will Win routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, Who Will Win triggers a quick verification flow that finishes in minutes.

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.