Highest temperature in Seoul on June 16?

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Market context

Seoul's weather on 16 June 2026 will be measured by the highest temperature recorded at Incheon International Airport's weather station that day, with settlement in USDC against Wunderground's historical data. The market currently shows 0% implied probability across all temperature bands, suggesting either incomplete price discovery or genuine uncertainty about which range will resolve.

Mid-June in Seoul typically falls within the early monsoon season, with historical highs ranging from 28–32°C depending on atmospheric patterns. The 0% reading across all outcomes is unusual for a weather market with a defined settlement source and suggests traders have not yet engaged with pricing. Comparable June temperature markets in East Asia have historically clustered around 30–33°C ranges, though individual daily extremes can deviate significantly based on frontal systems or high-pressure ridges. Wunderground's historical records for Incheon show considerable day-to-day variance during this period, with some years recording peaks above 33°C and others remaining below 28°C.

Traders should monitor seasonal forecasts released by the Korea Meteorological Administration in the weeks preceding the settlement date, as these typically provide directional guidance on whether June 2026 will trend warmer or cooler than the 30-year normal. Real-time atmospheric indices—particularly the East Asian summer monsoon onset timing and any tropical cyclone activity in the Western Pacific—can shift daily maxima substantially. The settlement window closes at 12:00 UTC on 16 June, so final temperature readings will be locked after local midnight in Seoul, removing any intraday trading advantage based on live weather updates.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Where can I trade this market with the lowest fees?

On BTC Prediction, 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?

BTC Prediction 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 BTC Prediction?

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

Do I need to KYC for this market?

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