Highest temperature in Seoul on June 17?

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Market context

Seoul's weather on 17 June 2026 will be measured at Incheon International Airport, the standard meteorological station for the region. Early summer conditions in mid-June typically bring warm, humid air masses from the Pacific, with daily highs commonly reaching 25–28°C. The settlement window closes at midday on the date itself, meaning only temperatures recorded up to that point will count toward resolution.

Historical June data from Incheon shows considerable year-to-year variation. The past decade's mid-June highs have ranged from 22°C during cooler, wetter years to 31°C during heat-driven periods. The 2018 heat wave pushed temperatures above 30°C in mid-June, whilst 2020 saw more moderate conditions around 24–26°C. This variability reflects the transition period between spring and the onset of the East Asian summer monsoon, when either cool maritime influences or continental heat can dominate.

The key variable traders should monitor is the position of the North Pacific high-pressure system relative to the Korean Peninsula in early-to-mid June 2026. Extended-range forecasts become more reliable approximately two weeks before the date; current seasonal outlooks from the Korea Meteorological Administration will indicate whether June 2026 tracks toward warmer or cooler-than-normal conditions. Any significant atmospheric pattern shifts—such as early monsoon onset or a stalled high-pressure ridge—would substantially alter the probability distribution across temperature ranges.

Methodology

We track Highest temperature in Seoul on June 17? 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 Prediction Today, 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?

Prediction Today 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'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.

What does it cost to trade on Prediction Today?

Zero. Prediction Today 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.