Highest temperature in Seoul on June 27?

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Market context

Seoul is bracing for a significant heatwave as June temperatures across South Korea have already shattered historical records, with cities like Mokpo and Daegu hitting unprecedented highs earlier this week. The Korea Meteorological Administration confirmed that multiple locations, including Busan and Daegu, broke June temperature records on Monday, signalling an intense thermal pattern that is likely to persist into the settlement window for this prediction market.

Historically, June in Seoul sees daily highs rising from 77°F to 81°F, rarely exceeding 87°F, yet recent data from 2025 shows Seoul reaching 35.8°C during a record-breaking summer. While the current crowd-implied probability for the highest temperature is 0%, comparable cases from 2018 demonstrate Seoul soaring to 39.6°C, suggesting that extreme outliers are not impossible despite the market's current scepticism. Traders should note that the average accumulated growing degree days in Seoul are rapidly increasing during June, which often correlates with higher peak temperatures.

Key catalysts to watch include official announcements from the Korea Meteorological Administration regarding the progression of the current heatwave, as well as real-time updates from Weather Underground for the Incheon Intl Airport Station. The settlement window ends on 27 June 2026 at 12:00 UTC, meaning any sudden escalation in the heatwave could drastically alter the outcome. Recent reports indicate that South Korea set a new all-time heat record of 41.0°C at Hongcheon, reinforcing the potential for extreme temperatures in the region. Traders must monitor these dependencies closely, as the market's current 0% probability may be underestimating the volatility of this weather event.

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Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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 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.

Is this market available outside the US?

PolyGram 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 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.

Do I need to KYC for this market?

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