Highest temperature in Seoul on June 21?

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Market context

The underlying event is the peak daytime heat recorded at Incheon International Airport on 21 June 2026, which will determine the settlement of this temperature range market. Historical data shows Seoul’s June highs typically average 26°C (80°F), rarely exceeding 30°C, though recent years have seen record-breaking spikes, including a national all-time high of 41.0°C in Hongcheon in 2023[3]. In June 2025, Seoul itself hit 35.8°C, and 59 weather stations across South Korea recorded their highest June averages ever[5][7]. This context suggests the current 0% YES probability may be overly conservative if traders are ignoring the trend of intensifying summer heat in the region.

Traders should monitor daily weather bulletins from the Korea Meteorological Administration and Wunderground’s real-time updates for Incheon, as sudden convective storms or heat domes could shift temperatures unexpectedly[4]. A recent report from Climate Central noted South Korea endured record-breaking summer heat in August 2025, with multiple cities exceeding 35°C, indicating a persistent warming pattern that could influence June 2026 conditions[5]. Regulatory accessibility hinges on jurisdiction: under Germany’s GlüStV, prediction markets face strict licensing, while the US CFTC maintains reach over unregistered platforms. However, the “no-KYC up to $1,500” clause allows retail participants in many regions to access this market without identity verification, provided they remain under the threshold, enhancing liquidity for those in less regulated territories.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Tax UK, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Tax UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket Tax UK 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.

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'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.

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.