Highest temperature in Seoul on June 23?

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Market context

On 23 June 2026, the Incheon International Airport Station will record its peak temperature for the day, a single data point that determines the outcome of this prediction market. The current crowd-implied probability sits at 0% for a “YES” resolution, reflecting a consensus that the temperature will not fall into the specific range being wagered on. This near-zero stance suggests traders believe the day will be unusually cool or that the target range is implausibly high for mid-June in this region.

Historically, June highs in Seoul typically climb from 77°F to 81°F (25°C to 27°C), rarely exceeding 87°F (31°C) [1]. While South Korea has seen extreme heat, such as the all-time record of 41.0°C in Hongcheon [2], Seoul itself has only occasionally breached 35°C, with a notable spike to 39.6°C in August 2018 [5][8]. Recent data shows the highest temperature in Seoul this June was 91°F (32.8°C) on 19 June 2026 [3], indicating the season is warming but still within typical bounds. The 0% probability may therefore be overconfident if the target range is modest, such as 28–30°C, where value could lie for contrarian traders.

Traders should monitor the Korea Meteorological Administration’s daily forecasts and any sudden shifts in cloud cover or wind patterns, which can suppress peak temperatures. A recent report from Gwangju News highlights that South Korea’s three hottest summers—1994, 2018, and 2024—each broke prior records, suggesting a trend toward intensifying heat [7]. If the atmosphere follows this pattern, a contrarian angle betting on a higher-than-expected peak could offer value, especially if the market remains anchored to historical averages rather than emerging climate trends.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Seoul on June 23? 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

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 Who Will Win, 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?

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.

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.