Highest temperature in Seoul on June 27?

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Market context

The market resolves to the highest temperature recorded at Incheon International Airport on 27 June 2026, with the current crowd-implied probability for a "YES" outcome sitting at 0%. This zero probability likely reflects a specific binary threshold in the contract definition that the market believes will not be breached, rather than a dismissal of the heat event itself. Historical data for Seoul in June shows daily highs typically climbing from 77°F to 81°F, rarely exceeding 87°F, while the average solar energy incident gradually decreases by 0.5 kWh throughout the month[2]. Recent records are significant; South Korea endured its hottest summer on record in 2025, with Seoul hitting 35.8°C, and an all-time national peak of 41.0°C was set in Hongcheon in 2023[3][4]. Just days prior, on 19 June 2026, the region recorded a high of 91°F (32.8°C), suggesting the atmosphere remains primed for elevated temperatures[5].

Traders should monitor the official Wunderground daily feed for Incheon, which serves as the definitive resolution source, alongside broader macro indicators that often correlate with extreme weather events in the region. While weather itself is not directly tied to on-chain mechanics, the USDC settlement and BTC/ETH macro tie-ins mean that sudden volatility in crypto funding rates or whale flows could impact liquidity in this specific market if a major weather announcement triggers a broader risk-off sentiment[1]. Recent news highlights that South Korea's average temperature from June to August 2025 was the highest since 1973, a trend that may persist into 2026[6]. Watch for any sudden shifts in exchange spot prices or funding rates, as these often precede significant market movements in prediction contracts tied to real-world volatility, even if the weather event is the primary catalyst. The market's current pricing suggests a high degree of confidence in a specific temperature range, likely 28°C or 29°C, which aligns with the frontrunner data on Polymarket[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Seoul on June 27? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed for comparison. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

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

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.

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.