Pronóstico: Highest temperature in Seoul on June 27?

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Market context

The underlying real-world event is the highest temperature recorded at Incheon International Airport on 27 June 2026, measured in degrees Celsius. Historical data frames the current 0% YES probability as a mispricing; June in Seoul typically sees highs between 19°C and 28°C, with the average warmest day reaching 28.06°C, though extreme spikes to 34.0°C have occurred on 19 June this year[1][6][7]. AccuWeather forecasts daily highs for June 2026 between 89°F and 91°F (roughly 32°C to 33°C), suggesting that a temperature exceeding common ranges is plausible rather than impossible[3]. The monsoon season, which spans June to July, introduces humidity but rarely prevents significant heat events, making the zero probability on the contract appear detached from the region's actual thermal volatility[1][2].

Traders must monitor the Korea Meteorological Administration’s short-range forecasts and Wunderground’s hourly updates for the Incheon station as the settlement window closes[4]. The primary catalyst is the onset of the monsoon, which could suppress temperatures, yet recent records show elevated sea surface temperatures driving heat, with May 2026 being the hottest May ever recorded[10]. A sudden heatwave before the 27th could push temperatures well above 30°C, invalidating the crowd-implied certainty of a low reading. On-chain mechanics on Polymarket, using USDC on the Polygon network and conditional tokens, allow immediate positioning against this 0% probability if forecast data shifts[10]. The market resolves based on the highest temperature recorded for all times on that day, meaning even a brief afternoon spike determines the outcome[4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: 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

Where can I trade this market with the lowest fees?

On PolyGram, 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.

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 does it cost to trade on PolyGram?

Zero. PolyGram 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.